diff --git a/configure b/configure
index d9b41e504..b35cb1d52 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.67.
+# Generated by GNU Autoconf 2.68.
 #
 #
 # Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
@@ -89,6 +89,7 @@ fi
 IFS=" ""	$as_nl"
 
 # Find who we are.  Look in the path if we contain no directory separator.
+as_myself=
 case $0 in #((
   *[\\/]* ) as_myself=$0 ;;
   *) as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
@@ -214,11 +215,18 @@ IFS=$as_save_IFS
   # We cannot yet assume a decent shell, so we have to provide a
 	# neutralization value for shells without unset; and this also
 	# works around shells that cannot unset nonexistent variables.
+	# Preserve -v and -x to the replacement shell.
 	BASH_ENV=/dev/null
 	ENV=/dev/null
 	(unset BASH_ENV) >/dev/null 2>&1 && unset BASH_ENV ENV
 	export CONFIG_SHELL
-	exec "$CONFIG_SHELL" "$as_myself" ${1+"$@"}
+	case $- in # ((((
+	  *v*x* | *x*v* ) as_opts=-vx ;;
+	  *v* ) as_opts=-v ;;
+	  *x* ) as_opts=-x ;;
+	  * ) as_opts= ;;
+	esac
+	exec "$CONFIG_SHELL" $as_opts "$as_myself" ${1+"$@"}
 fi
 
     if test x$as_have_required = xno; then :
@@ -1208,7 +1216,7 @@ Try \`$0 --help' for more information"
     $as_echo "$as_me: WARNING: you should use --build, --host, --target" >&2
     expr "x$ac_option" : ".*[^-._$as_cr_alnum]" >/dev/null &&
       $as_echo "$as_me: WARNING: invalid host type: $ac_option" >&2
-    : ${build_alias=$ac_option} ${host_alias=$ac_option} ${target_alias=$ac_option}
+    : "${build_alias=$ac_option} ${host_alias=$ac_option} ${target_alias=$ac_option}"
     ;;
 
   esac
@@ -1544,7 +1552,7 @@ test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
 configure
-generated by GNU Autoconf 2.67
+generated by GNU Autoconf 2.68
 
 Copyright (C) 2010 Free Software Foundation, Inc.
 This configure script is free software; the Free Software Foundation
@@ -1590,7 +1598,7 @@ sed 's/^/| /' conftest.$ac_ext >&5
 
 	ac_retval=1
 fi
-  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
   as_fn_set_status $ac_retval
 
 } # ac_fn_c_try_compile
@@ -1628,7 +1636,7 @@ sed 's/^/| /' conftest.$ac_ext >&5
 
 	ac_retval=1
 fi
-  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
   as_fn_set_status $ac_retval
 
 } # ac_fn_cxx_try_compile
@@ -1674,7 +1682,7 @@ fi
   # interfere with the next link command; also delete a directory that is
   # left behind by Apple's compiler.  We do this before executing the actions.
   rm -rf conftest.dSYM conftest_ipa8_conftest.oo
-  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
   as_fn_set_status $ac_retval
 
 } # ac_fn_c_try_link
@@ -1711,7 +1719,7 @@ sed 's/^/| /' conftest.$ac_ext >&5
 
     ac_retval=1
 fi
-  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
   as_fn_set_status $ac_retval
 
 } # ac_fn_c_try_cpp
@@ -1724,10 +1732,10 @@ fi
 ac_fn_c_check_header_mongrel ()
 {
   as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
-  if eval "test \"\${$3+set}\"" = set; then :
+  if eval \${$3+:} false; then :
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
 $as_echo_n "checking for $2... " >&6; }
-if eval "test \"\${$3+set}\"" = set; then :
+if eval \${$3+:} false; then :
   $as_echo_n "(cached) " >&6
 fi
 eval ac_res=\$$3
@@ -1790,7 +1798,7 @@ $as_echo "$as_me: WARNING: $2: proceeding with the compiler's result" >&2;}
 esac
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
 $as_echo_n "checking for $2... " >&6; }
-if eval "test \"\${$3+set}\"" = set; then :
+if eval \${$3+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   eval "$3=\$ac_header_compiler"
@@ -1799,7 +1807,7 @@ eval ac_res=\$$3
 	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
 $as_echo "$ac_res" >&6; }
 fi
-  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
 
 } # ac_fn_c_check_header_mongrel
 
@@ -1840,7 +1848,7 @@ sed 's/^/| /' conftest.$ac_ext >&5
        ac_retval=$ac_status
 fi
   rm -rf conftest.dSYM conftest_ipa8_conftest.oo
-  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
   as_fn_set_status $ac_retval
 
 } # ac_fn_c_try_run
@@ -1854,7 +1862,7 @@ ac_fn_c_check_header_compile ()
   as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
 $as_echo_n "checking for $2... " >&6; }
-if eval "test \"\${$3+set}\"" = set; then :
+if eval \${$3+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
@@ -1872,7 +1880,7 @@ fi
 eval ac_res=\$$3
 	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
 $as_echo "$ac_res" >&6; }
-  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
 
 } # ac_fn_c_check_header_compile
 
@@ -1884,7 +1892,7 @@ ac_fn_c_check_func ()
   as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
 $as_echo_n "checking for $2... " >&6; }
-if eval "test \"\${$3+set}\"" = set; then :
+if eval \${$3+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
@@ -1939,7 +1947,7 @@ fi
 eval ac_res=\$$3
 	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
 $as_echo "$ac_res" >&6; }
-  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
 
 } # ac_fn_c_check_func
 
@@ -2116,7 +2124,7 @@ rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
 rm -f conftest.val
 
   fi
-  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
   as_fn_set_status $ac_retval
 
 } # ac_fn_c_compute_int
@@ -2130,7 +2138,7 @@ ac_fn_c_check_type ()
   as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
 $as_echo_n "checking for $2... " >&6; }
-if eval "test \"\${$3+set}\"" = set; then :
+if eval \${$3+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   eval "$3=no"
@@ -2171,7 +2179,7 @@ fi
 eval ac_res=\$$3
 	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
 $as_echo "$ac_res" >&6; }
-  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
 
 } # ac_fn_c_check_type
 
@@ -2184,7 +2192,7 @@ ac_fn_c_check_member ()
   as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2.$3" >&5
 $as_echo_n "checking for $2.$3... " >&6; }
-if eval "test \"\${$4+set}\"" = set; then :
+if eval \${$4+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
@@ -2228,7 +2236,7 @@ fi
 eval ac_res=\$$4
 	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
 $as_echo "$ac_res" >&6; }
-  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
 
 } # ac_fn_c_check_member
 cat >config.log <<_ACEOF
@@ -2236,7 +2244,7 @@ This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
 It was created by $as_me, which was
-generated by GNU Autoconf 2.67.  Invocation command line was
+generated by GNU Autoconf 2.68.  Invocation command line was
 
   $ $0 $@
 
@@ -2598,7 +2606,7 @@ if test -n "$ac_tool_prefix"; then
 set dummy ${ac_tool_prefix}gcc; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_CC+set}" = set; then :
+if ${ac_cv_prog_CC+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$CC"; then
@@ -2638,7 +2646,7 @@ if test -z "$ac_cv_prog_CC"; then
 set dummy gcc; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_ac_ct_CC+set}" = set; then :
+if ${ac_cv_prog_ac_ct_CC+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$ac_ct_CC"; then
@@ -2691,7 +2699,7 @@ if test -z "$CC"; then
 set dummy ${ac_tool_prefix}cc; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_CC+set}" = set; then :
+if ${ac_cv_prog_CC+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$CC"; then
@@ -2731,7 +2739,7 @@ if test -z "$CC"; then
 set dummy cc; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_CC+set}" = set; then :
+if ${ac_cv_prog_CC+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$CC"; then
@@ -2790,7 +2798,7 @@ if test -z "$CC"; then
 set dummy $ac_tool_prefix$ac_prog; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_CC+set}" = set; then :
+if ${ac_cv_prog_CC+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$CC"; then
@@ -2834,7 +2842,7 @@ do
 set dummy $ac_prog; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_ac_ct_CC+set}" = set; then :
+if ${ac_cv_prog_ac_ct_CC+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$ac_ct_CC"; then
@@ -3117,7 +3125,7 @@ rm -f conftest.$ac_ext conftest$ac_cv_exeext conftest.out
 ac_clean_files=$ac_clean_files_save
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for suffix of object files" >&5
 $as_echo_n "checking for suffix of object files... " >&6; }
-if test "${ac_cv_objext+set}" = set; then :
+if ${ac_cv_objext+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
@@ -3168,7 +3176,7 @@ OBJEXT=$ac_cv_objext
 ac_objext=$OBJEXT
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether we are using the GNU C compiler" >&5
 $as_echo_n "checking whether we are using the GNU C compiler... " >&6; }
-if test "${ac_cv_c_compiler_gnu+set}" = set; then :
+if ${ac_cv_c_compiler_gnu+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
@@ -3205,7 +3213,7 @@ ac_test_CFLAGS=${CFLAGS+set}
 ac_save_CFLAGS=$CFLAGS
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC accepts -g" >&5
 $as_echo_n "checking whether $CC accepts -g... " >&6; }
-if test "${ac_cv_prog_cc_g+set}" = set; then :
+if ${ac_cv_prog_cc_g+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_save_c_werror_flag=$ac_c_werror_flag
@@ -3283,7 +3291,7 @@ else
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $CC option to accept ISO C89" >&5
 $as_echo_n "checking for $CC option to accept ISO C89... " >&6; }
-if test "${ac_cv_prog_cc_c89+set}" = set; then :
+if ${ac_cv_prog_cc_c89+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_cv_prog_cc_c89=no
@@ -3394,7 +3402,7 @@ if test -z "$CXX"; then
 set dummy $ac_tool_prefix$ac_prog; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_CXX+set}" = set; then :
+if ${ac_cv_prog_CXX+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$CXX"; then
@@ -3438,7 +3446,7 @@ do
 set dummy $ac_prog; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_ac_ct_CXX+set}" = set; then :
+if ${ac_cv_prog_ac_ct_CXX+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$ac_ct_CXX"; then
@@ -3516,7 +3524,7 @@ done
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether we are using the GNU C++ compiler" >&5
 $as_echo_n "checking whether we are using the GNU C++ compiler... " >&6; }
-if test "${ac_cv_cxx_compiler_gnu+set}" = set; then :
+if ${ac_cv_cxx_compiler_gnu+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
@@ -3553,7 +3561,7 @@ ac_test_CXXFLAGS=${CXXFLAGS+set}
 ac_save_CXXFLAGS=$CXXFLAGS
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CXX accepts -g" >&5
 $as_echo_n "checking whether $CXX accepts -g... " >&6; }
-if test "${ac_cv_prog_cxx_g+set}" = set; then :
+if ${ac_cv_prog_cxx_g+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_save_cxx_werror_flag=$ac_cxx_werror_flag
@@ -3641,7 +3649,7 @@ do
 set dummy $ac_prog; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_AWK+set}" = set; then :
+if ${ac_cv_prog_AWK+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$AWK"; then
@@ -4196,7 +4204,7 @@ $SHELL "$ac_aux_dir/config.sub" sun4 >/dev/null 2>&1 ||
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking build system type" >&5
 $as_echo_n "checking build system type... " >&6; }
-if test "${ac_cv_build+set}" = set; then :
+if ${ac_cv_build+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_build_alias=$build_alias
@@ -4230,7 +4238,7 @@ case $build_os in *\ *) build_os=`echo "$build_os" | sed 's/ /-/g'`;; esac
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking host system type" >&5
 $as_echo_n "checking host system type... " >&6; }
-if test "${ac_cv_host+set}" = set; then :
+if ${ac_cv_host+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test "x$host_alias" = x; then
@@ -4263,7 +4271,7 @@ case $host_os in *\ *) host_os=`echo "$host_os" | sed 's/ /-/g'`;; esac
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking target system type" >&5
 $as_echo_n "checking target system type... " >&6; }
-if test "${ac_cv_target+set}" = set; then :
+if ${ac_cv_target+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test "x$target_alias" = x; then
@@ -4507,7 +4515,7 @@ fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for a BSD-compatible install" >&5
 $as_echo_n "checking for a BSD-compatible install... " >&6; }
 if test -z "$INSTALL"; then
-if test "${ac_cv_path_install+set}" = set; then :
+if ${ac_cv_path_install+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
@@ -4588,7 +4596,7 @@ if test -n "$ac_tool_prefix"; then
 set dummy ${ac_tool_prefix}ranlib; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_RANLIB+set}" = set; then :
+if ${ac_cv_prog_RANLIB+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$RANLIB"; then
@@ -4628,7 +4636,7 @@ if test -z "$ac_cv_prog_RANLIB"; then
 set dummy ranlib; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_ac_ct_RANLIB+set}" = set; then :
+if ${ac_cv_prog_ac_ct_RANLIB+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$ac_ct_RANLIB"; then
@@ -4680,7 +4688,7 @@ if test -n "$ac_tool_prefix"; then
 set dummy ${ac_tool_prefix}indent; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_INDENT+set}" = set; then :
+if ${ac_cv_prog_INDENT+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$INDENT"; then
@@ -4720,7 +4728,7 @@ if test -z "$ac_cv_prog_INDENT"; then
 set dummy indent; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_ac_ct_INDENT+set}" = set; then :
+if ${ac_cv_prog_ac_ct_INDENT+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$ac_ct_INDENT"; then
@@ -4772,7 +4780,7 @@ if test -n "$ac_tool_prefix"; then
 set dummy ${ac_tool_prefix}ar; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_AR+set}" = set; then :
+if ${ac_cv_prog_AR+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$AR"; then
@@ -4812,7 +4820,7 @@ if test -z "$ac_cv_prog_AR"; then
 set dummy ar; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_ac_ct_AR+set}" = set; then :
+if ${ac_cv_prog_ac_ct_AR+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$ac_ct_AR"; then
@@ -4864,7 +4872,7 @@ if test -n "$ac_tool_prefix"; then
 set dummy ${ac_tool_prefix}mpicc; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_MPI_CC+set}" = set; then :
+if ${ac_cv_prog_MPI_CC+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$MPI_CC"; then
@@ -4904,7 +4912,7 @@ if test -z "$ac_cv_prog_MPI_CC"; then
 set dummy mpicc; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_ac_ct_MPI_CC+set}" = set; then :
+if ${ac_cv_prog_ac_ct_MPI_CC+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -n "$ac_ct_MPI_CC"; then
@@ -4955,7 +4963,7 @@ fi
 set dummy install-info; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_path_INSTALL_INFO+set}" = set; then :
+if ${ac_cv_path_INSTALL_INFO+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   case $INSTALL_INFO in
@@ -4997,7 +5005,7 @@ fi
 set dummy sh; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_path_SHELL+set}" = set; then :
+if ${ac_cv_path_SHELL+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   case $SHELL in
@@ -5044,7 +5052,7 @@ then
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lws2_32" >&5
 $as_echo_n "checking for main in -lws2_32... " >&6; }
-if test "${ac_cv_lib_ws2_32_main+set}" = set; then :
+if ${ac_cv_lib_ws2_32_main+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -5072,7 +5080,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ws2_32_main" >&5
 $as_echo "$ac_cv_lib_ws2_32_main" >&6; }
-if test "x$ac_cv_lib_ws2_32_main" = x""yes; then :
+if test "x$ac_cv_lib_ws2_32_main" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_LIBWS2_32 1
 _ACEOF
@@ -5088,7 +5096,7 @@ fi
       CXX="${CXX}  -mno-cygwin"
       { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lwsock32" >&5
 $as_echo_n "checking for main in -lwsock32... " >&6; }
-if test "${ac_cv_lib_wsock32_main+set}" = set; then :
+if ${ac_cv_lib_wsock32_main+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -5116,7 +5124,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_wsock32_main" >&5
 $as_echo "$ac_cv_lib_wsock32_main" >&6; }
-if test "x$ac_cv_lib_wsock32_main" = x""yes; then :
+if test "x$ac_cv_lib_wsock32_main" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_LIBWSOCK32 1
 _ACEOF
@@ -5129,7 +5137,7 @@ fi
     else
       { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lwsock32" >&5
 $as_echo_n "checking for main in -lwsock32... " >&6; }
-if test "${ac_cv_lib_wsock32_main+set}" = set; then :
+if ${ac_cv_lib_wsock32_main+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -5157,7 +5165,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_wsock32_main" >&5
 $as_echo "$ac_cv_lib_wsock32_main" >&6; }
-if test "x$ac_cv_lib_wsock32_main" = x""yes; then :
+if test "x$ac_cv_lib_wsock32_main" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_LIBWSOCK32 1
 _ACEOF
@@ -5170,7 +5178,7 @@ fi
     fi
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lpsapi" >&5
 $as_echo_n "checking for main in -lpsapi... " >&6; }
-if test "${ac_cv_lib_psapi_main+set}" = set; then :
+if ${ac_cv_lib_psapi_main+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -5198,7 +5206,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_psapi_main" >&5
 $as_echo "$ac_cv_lib_psapi_main" >&6; }
-if test "x$ac_cv_lib_psapi_main" = x""yes; then :
+if test "x$ac_cv_lib_psapi_main" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_LIBPSAPI 1
 _ACEOF
@@ -5234,7 +5242,7 @@ else
   ENABLE_WINCONSOLE="#"
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for sin in -lm" >&5
 $as_echo_n "checking for sin in -lm... " >&6; }
-if test "${ac_cv_lib_m_sin+set}" = set; then :
+if ${ac_cv_lib_m_sin+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -5268,7 +5276,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_m_sin" >&5
 $as_echo "$ac_cv_lib_m_sin" >&6; }
-if test "x$ac_cv_lib_m_sin" = x""yes; then :
+if test "x$ac_cv_lib_m_sin" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_LIBM 1
 _ACEOF
@@ -5279,7 +5287,7 @@ fi
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for socket in -lsocket" >&5
 $as_echo_n "checking for socket in -lsocket... " >&6; }
-if test "${ac_cv_lib_socket_socket+set}" = set; then :
+if ${ac_cv_lib_socket_socket+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -5313,7 +5321,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_socket_socket" >&5
 $as_echo "$ac_cv_lib_socket_socket" >&6; }
-if test "x$ac_cv_lib_socket_socket" = x""yes; then :
+if test "x$ac_cv_lib_socket_socket" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_LIBSOCKET 1
 _ACEOF
@@ -5324,7 +5332,7 @@ fi
 
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking for getsockname in -lxnet" >&5
 $as_echo_n "checking for getsockname in -lxnet... " >&6; }
-if test "${ac_cv_lib_xnet_getsockname+set}" = set; then :
+if ${ac_cv_lib_xnet_getsockname+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -5358,7 +5366,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_xnet_getsockname" >&5
 $as_echo "$ac_cv_lib_xnet_getsockname" >&6; }
-if test "x$ac_cv_lib_xnet_getsockname" = x""yes; then :
+if test "x$ac_cv_lib_xnet_getsockname" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_LIBXNET 1
 _ACEOF
@@ -5369,7 +5377,7 @@ fi
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lstdc++" >&5
 $as_echo_n "checking for main in -lstdc++... " >&6; }
-if test "${ac_cv_lib_stdcpp_main+set}" = set; then :
+if ${ac_cv_lib_stdcpp_main+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -5397,7 +5405,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_stdcpp_main" >&5
 $as_echo "$ac_cv_lib_stdcpp_main" >&6; }
-if test "x$ac_cv_lib_stdcpp_main" = x""yes; then :
+if test "x$ac_cv_lib_stdcpp_main" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_LIBSTDC__ 1
 _ACEOF
@@ -5408,7 +5416,7 @@ fi
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lnsl" >&5
 $as_echo_n "checking for main in -lnsl... " >&6; }
-if test "${ac_cv_lib_nsl_main+set}" = set; then :
+if ${ac_cv_lib_nsl_main+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -5436,7 +5444,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nsl_main" >&5
 $as_echo "$ac_cv_lib_nsl_main" >&6; }
-if test "x$ac_cv_lib_nsl_main" = x""yes; then :
+if test "x$ac_cv_lib_nsl_main" = xyes; then :
   have_nsl=yes
 
 else
@@ -5445,7 +5453,7 @@ fi
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lcrypt" >&5
 $as_echo_n "checking for main in -lcrypt... " >&6; }
-if test "${ac_cv_lib_crypt_main+set}" = set; then :
+if ${ac_cv_lib_crypt_main+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -5473,7 +5481,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_crypt_main" >&5
 $as_echo "$ac_cv_lib_crypt_main" >&6; }
-if test "x$ac_cv_lib_crypt_main" = x""yes; then :
+if test "x$ac_cv_lib_crypt_main" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_LIBCRYPT 1
 _ACEOF
@@ -5484,7 +5492,7 @@ fi
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lnss_files" >&5
 $as_echo_n "checking for main in -lnss_files... " >&6; }
-if test "${ac_cv_lib_nss_files_main+set}" = set; then :
+if ${ac_cv_lib_nss_files_main+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -5512,7 +5520,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss_files_main" >&5
 $as_echo "$ac_cv_lib_nss_files_main" >&6; }
-if test "x$ac_cv_lib_nss_files_main" = x""yes; then :
+if test "x$ac_cv_lib_nss_files_main" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_LIBNSS_FILES 1
 _ACEOF
@@ -5523,7 +5531,7 @@ fi
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lnss_dns" >&5
 $as_echo_n "checking for main in -lnss_dns... " >&6; }
-if test "${ac_cv_lib_nss_dns_main+set}" = set; then :
+if ${ac_cv_lib_nss_dns_main+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -5551,7 +5559,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss_dns_main" >&5
 $as_echo "$ac_cv_lib_nss_dns_main" >&6; }
-if test "x$ac_cv_lib_nss_dns_main" = x""yes; then :
+if test "x$ac_cv_lib_nss_dns_main" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_LIBNSS_DNS 1
 _ACEOF
@@ -5562,7 +5570,7 @@ fi
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lresolv" >&5
 $as_echo_n "checking for main in -lresolv... " >&6; }
-if test "${ac_cv_lib_resolv_main+set}" = set; then :
+if ${ac_cv_lib_resolv_main+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -5590,7 +5598,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_resolv_main" >&5
 $as_echo "$ac_cv_lib_resolv_main" >&6; }
-if test "x$ac_cv_lib_resolv_main" = x""yes; then :
+if test "x$ac_cv_lib_resolv_main" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_LIBRESOLV 1
 _ACEOF
@@ -5603,62 +5611,13 @@ fi
 
 if test "$yap_cv_readline" != "no"
 then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for tgetent in -ltermcap" >&5
-$as_echo_n "checking for tgetent in -ltermcap... " >&6; }
-if test "${ac_cv_lib_termcap_tgetent+set}" = set; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lreadline" >&5
+$as_echo_n "checking for main in -lreadline... " >&6; }
+if ${ac_cv_lib_readline_main+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
-LIBS="-ltermcap  $LIBS"
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-/* Override any GCC internal prototype to avoid an error.
-   Use char because int might match the return type of a GCC
-   builtin and then its argument prototype would still apply.  */
-#ifdef __cplusplus
-extern "C"
-#endif
-char tgetent ();
-int
-main ()
-{
-return tgetent ();
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-  ac_cv_lib_termcap_tgetent=yes
-else
-  ac_cv_lib_termcap_tgetent=no
-fi
-rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_termcap_tgetent" >&5
-$as_echo "$ac_cv_lib_termcap_tgetent" >&6; }
-if test "x$ac_cv_lib_termcap_tgetent" = x""yes; then :
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_LIBTERMCAP 1
-_ACEOF
-
-  LIBS="-ltermcap $LIBS"
-
-fi
-
-  case "$target_os" in
-    *darwin*)
-    ;;
-    *)
-    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lncurses" >&5
-$as_echo_n "checking for main in -lncurses... " >&6; }
-if test "${ac_cv_lib_ncurses_main+set}" = set; then :
-  $as_echo_n "(cached) " >&6
-else
-  ac_check_lib_save_LIBS=$LIBS
-LIBS="-lncurses  $LIBS"
+LIBS="-lreadline -lncurses $LIBS"
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
@@ -5672,68 +5631,30 @@ return main ();
 }
 _ACEOF
 if ac_fn_c_try_link "$LINENO"; then :
-  ac_cv_lib_ncurses_main=yes
+  ac_cv_lib_readline_main=yes
 else
-  ac_cv_lib_ncurses_main=no
+  ac_cv_lib_readline_main=no
 fi
 rm -f core conftest.err conftest.$ac_objext \
     conftest$ac_exeext conftest.$ac_ext
 LIBS=$ac_check_lib_save_LIBS
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ncurses_main" >&5
-$as_echo "$ac_cv_lib_ncurses_main" >&6; }
-if test "x$ac_cv_lib_ncurses_main" = x""yes; then :
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_LIBNCURSES 1
-_ACEOF
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_readline_main" >&5
+$as_echo "$ac_cv_lib_readline_main" >&6; }
+if test "x$ac_cv_lib_readline_main" = xyes; then :
 
-  LIBS="-lncurses $LIBS"
 
-fi
+$as_echo "#define HAVE_LIBREADLINE 1" >>confdefs.h
+
+		LIBS="$LIBS -lreadline -lncurses"
 
-  esac
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for readline in -lreadline" >&5
-$as_echo_n "checking for readline in -lreadline... " >&6; }
-if test "${ac_cv_lib_readline_readline+set}" = set; then :
-  $as_echo_n "(cached) " >&6
 else
-  ac_check_lib_save_LIBS=$LIBS
-LIBS="-lreadline  $LIBS"
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-/* Override any GCC internal prototype to avoid an error.
-   Use char because int might match the return type of a GCC
-   builtin and then its argument prototype would still apply.  */
-#ifdef __cplusplus
-extern "C"
-#endif
-char readline ();
-int
-main ()
-{
-return readline ();
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-  ac_cv_lib_readline_readline=yes
-else
-  ac_cv_lib_readline_readline=no
-fi
-rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_readline_readline" >&5
-$as_echo "$ac_cv_lib_readline_readline" >&6; }
-if test "x$ac_cv_lib_readline_readline" = x""yes; then :
-  cat >>confdefs.h <<_ACEOF
-#define HAVE_LIBREADLINE 1
-_ACEOF
-
-  LIBS="-lreadline $LIBS"
+  if test "x$with_readline" != xcheck; then
+                 { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "--with-readline was given, but test for readline failed
+See \`config.log' for more details" "$LINENO" 5; }
+               fi
 
 fi
 
@@ -5742,7 +5663,7 @@ if test "$yap_cv_gmp" != "no"
 then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lgmp" >&5
 $as_echo_n "checking for main in -lgmp... " >&6; }
-if test "${ac_cv_lib_gmp_main+set}" = set; then :
+if ${ac_cv_lib_gmp_main+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -5770,7 +5691,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_gmp_main" >&5
 $as_echo "$ac_cv_lib_gmp_main" >&6; }
-if test "x$ac_cv_lib_gmp_main" = x""yes; then :
+if test "x$ac_cv_lib_gmp_main" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_LIBGMP 1
 _ACEOF
@@ -5784,7 +5705,7 @@ fi
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for zlibVersion in -lz" >&5
 $as_echo_n "checking for zlibVersion in -lz... " >&6; }
-if test "${ac_cv_lib_z_zlibVersion+set}" = set; then :
+if ${ac_cv_lib_z_zlibVersion+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -5818,7 +5739,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_z_zlibVersion" >&5
 $as_echo "$ac_cv_lib_z_zlibVersion" >&6; }
-if test "x$ac_cv_lib_z_zlibVersion" = x""yes; then :
+if test "x$ac_cv_lib_z_zlibVersion" = xyes; then :
   ZLIBS="-lz"
 	     ZLIB=yes
 else
@@ -5834,7 +5755,7 @@ if test "$yap_cv_myddas" != "no"
 then
 		{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lmysqlclient" >&5
 $as_echo_n "checking for main in -lmysqlclient... " >&6; }
-	if test "${yap_cv_mysql+set}" = set; then :
+	if ${yap_cv_mysql+:} false; then :
   $as_echo_n "(cached) " >&6
 else
 
@@ -5871,7 +5792,7 @@ $as_echo "$yap_cv_mysql" >&6; }
 
 		{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lodbc" >&5
 $as_echo_n "checking for main in -lodbc... " >&6; }
-	if test "${yap_cv_odbc+set}" = set; then :
+	if ${yap_cv_odbc+:} false; then :
   $as_echo_n "(cached) " >&6
 else
 
@@ -5925,7 +5846,7 @@ then
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pthread_create in -lpthread" >&5
 $as_echo_n "checking for pthread_create in -lpthread... " >&6; }
-if test "${ac_cv_lib_pthread_pthread_create+set}" = set; then :
+if ${ac_cv_lib_pthread_pthread_create+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -5959,7 +5880,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_pthread_pthread_create" >&5
 $as_echo "$ac_cv_lib_pthread_pthread_create" >&6; }
-if test "x$ac_cv_lib_pthread_pthread_create" = x""yes; then :
+if test "x$ac_cv_lib_pthread_pthread_create" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_LIBPTHREAD 1
 _ACEOF
@@ -5980,7 +5901,7 @@ if test -n "$CPP" && test -d "$CPP"; then
   CPP=
 fi
 if test -z "$CPP"; then
-  if test "${ac_cv_prog_CPP+set}" = set; then :
+  if ${ac_cv_prog_CPP+:} false; then :
   $as_echo_n "(cached) " >&6
 else
       # Double quotes because CPP needs to be expanded
@@ -6108,7 +6029,7 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for grep that handles long lines and -e" >&5
 $as_echo_n "checking for grep that handles long lines and -e... " >&6; }
-if test "${ac_cv_path_GREP+set}" = set; then :
+if ${ac_cv_path_GREP+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test -z "$GREP"; then
@@ -6171,7 +6092,7 @@ $as_echo "$ac_cv_path_GREP" >&6; }
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for egrep" >&5
 $as_echo_n "checking for egrep... " >&6; }
-if test "${ac_cv_path_EGREP+set}" = set; then :
+if ${ac_cv_path_EGREP+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if echo a | $GREP -E '(a|b)' >/dev/null 2>&1
@@ -6238,7 +6159,7 @@ $as_echo "$ac_cv_path_EGREP" >&6; }
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for ANSI C header files" >&5
 $as_echo_n "checking for ANSI C header files... " >&6; }
-if test "${ac_cv_header_stdc+set}" = set; then :
+if ${ac_cv_header_stdc+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
@@ -6368,7 +6289,7 @@ done
 for ac_header in pthread.h
 do :
   ac_fn_c_check_header_mongrel "$LINENO" "pthread.h" "ac_cv_header_pthread_h" "$ac_includes_default"
-if test "x$ac_cv_header_pthread_h" = x""yes; then :
+if test "x$ac_cv_header_pthread_h" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_PTHREAD_H 1
 _ACEOF
@@ -6489,7 +6410,7 @@ then
   CC=${MPI_CC}
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for MPI_Init in -lmpi" >&5
 $as_echo_n "checking for MPI_Init in -lmpi... " >&6; }
-if test "${ac_cv_lib_mpi_MPI_Init+set}" = set; then :
+if ${ac_cv_lib_mpi_MPI_Init+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -6523,7 +6444,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_mpi_MPI_Init" >&5
 $as_echo "$ac_cv_lib_mpi_MPI_Init" >&6; }
-if test "x$ac_cv_lib_mpi_MPI_Init" = x""yes; then :
+if test "x$ac_cv_lib_mpi_MPI_Init" = xyes; then :
   $as_echo "#define HAVE_LIBMPI 1" >>confdefs.h
 
 else
@@ -6538,7 +6459,7 @@ fi
   else
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking for MPI_Init in -lmpich" >&5
 $as_echo_n "checking for MPI_Init in -lmpich... " >&6; }
-if test "${ac_cv_lib_mpich_MPI_Init+set}" = set; then :
+if ${ac_cv_lib_mpich_MPI_Init+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -6572,7 +6493,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_mpich_MPI_Init" >&5
 $as_echo "$ac_cv_lib_mpich_MPI_Init" >&6; }
-if test "x$ac_cv_lib_mpich_MPI_Init" = x""yes; then :
+if test "x$ac_cv_lib_mpich_MPI_Init" = xyes; then :
   $as_echo "#define HAVE_LIBMPICH 1" >>confdefs.h
 
 else
@@ -6603,7 +6524,7 @@ then
   CC=${MPI_CC}
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for MPE_Init_log in -lmpe" >&5
 $as_echo_n "checking for MPE_Init_log in -lmpe... " >&6; }
-if test "${ac_cv_lib_mpe_MPE_Init_log+set}" = set; then :
+if ${ac_cv_lib_mpe_MPE_Init_log+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -6637,7 +6558,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_mpe_MPE_Init_log" >&5
 $as_echo "$ac_cv_lib_mpe_MPE_Init_log" >&6; }
-if test "x$ac_cv_lib_mpe_MPE_Init_log" = x""yes; then :
+if test "x$ac_cv_lib_mpe_MPE_Init_log" = xyes; then :
   $as_echo "#define HAVE_LIBMPE 1" >>confdefs.h
 
 else
@@ -6665,7 +6586,7 @@ if test -n "$CPP" && test -d "$CPP"; then
   CPP=
 fi
 if test -z "$CPP"; then
-  if test "${ac_cv_prog_CPP+set}" = set; then :
+  if ${ac_cv_prog_CPP+:} false; then :
   $as_echo_n "(cached) " >&6
 else
       # Double quotes because CPP needs to be expanded
@@ -6797,7 +6718,7 @@ then
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for sys/wait.h that is POSIX.1 compatible" >&5
 $as_echo_n "checking for sys/wait.h that is POSIX.1 compatible... " >&6; }
-if test "${ac_cv_header_sys_wait_h+set}" = set; then :
+if ${ac_cv_header_sys_wait_h+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
@@ -6838,7 +6759,7 @@ fi
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for restartable system calls" >&5
 $as_echo_n "checking for restartable system calls... " >&6; }
-if test "${ac_cv_sys_restartable_syscalls+set}" = set; then :
+if ${ac_cv_sys_restartable_syscalls+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if test "$cross_compiling" = yes; then :
@@ -6927,7 +6848,7 @@ case "$target_os" in
         then
 	  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for dlopen in -ldl" >&5
 $as_echo_n "checking for dlopen in -ldl... " >&6; }
-if test "${ac_cv_lib_dl_dlopen+set}" = set; then :
+if ${ac_cv_lib_dl_dlopen+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -6961,7 +6882,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_dl_dlopen" >&5
 $as_echo "$ac_cv_lib_dl_dlopen" >&6; }
-if test "x$ac_cv_lib_dl_dlopen" = x""yes; then :
+if test "x$ac_cv_lib_dl_dlopen" = xyes; then :
   have_dl=yes
 
 else
@@ -7089,7 +7010,7 @@ fi
         then
 	  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for dlopen in -ldl" >&5
 $as_echo_n "checking for dlopen in -ldl... " >&6; }
-if test "${ac_cv_lib_dl_dlopen+set}" = set; then :
+if ${ac_cv_lib_dl_dlopen+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -7123,7 +7044,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_dl_dlopen" >&5
 $as_echo "$ac_cv_lib_dl_dlopen" >&6; }
-if test "x$ac_cv_lib_dl_dlopen" = x""yes; then :
+if test "x$ac_cv_lib_dl_dlopen" = xyes; then :
   	     have_dl=yes
 
 else
@@ -7159,7 +7080,7 @@ fi
 	then
 	  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for dlopen in -ldl" >&5
 $as_echo_n "checking for dlopen in -ldl... " >&6; }
-if test "${ac_cv_lib_dl_dlopen+set}" = set; then :
+if ${ac_cv_lib_dl_dlopen+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -7193,7 +7114,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_dl_dlopen" >&5
 $as_echo "$ac_cv_lib_dl_dlopen" >&6; }
-if test "x$ac_cv_lib_dl_dlopen" = x""yes; then :
+if test "x$ac_cv_lib_dl_dlopen" = xyes; then :
   have_dl=yes
 
 else
@@ -7306,7 +7227,7 @@ fi
       *)
 	{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for dlopen in -ldl" >&5
 $as_echo_n "checking for dlopen in -ldl... " >&6; }
-if test "${ac_cv_lib_dl_dlopen+set}" = set; then :
+if ${ac_cv_lib_dl_dlopen+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -7340,7 +7261,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_dl_dlopen" >&5
 $as_echo "$ac_cv_lib_dl_dlopen" >&6; }
-if test "x$ac_cv_lib_dl_dlopen" = x""yes; then :
+if test "x$ac_cv_lib_dl_dlopen" = xyes; then :
   have_dl=yes
 
 else
@@ -7500,7 +7421,7 @@ fi
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for zlibVersion in -lz" >&5
 $as_echo_n "checking for zlibVersion in -lz... " >&6; }
-if test "${ac_cv_lib_z_zlibVersion+set}" = set; then :
+if ${ac_cv_lib_z_zlibVersion+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -7534,7 +7455,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_z_zlibVersion" >&5
 $as_echo "$ac_cv_lib_z_zlibVersion" >&6; }
-if test "x$ac_cv_lib_z_zlibVersion" = x""yes; then :
+if test "x$ac_cv_lib_z_zlibVersion" = xyes; then :
   ZLIBS="-lz"
 	     ZLIB=yes
 else
@@ -7570,7 +7491,7 @@ OLD_CC=${CC}
 CC=${LAM_MPI_CC}
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -llam" >&5
 $as_echo_n "checking for main in -llam... " >&6; }
-if test "${ac_cv_lib_lam_main+set}" = set; then :
+if ${ac_cv_lib_lam_main+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -7598,7 +7519,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_lam_main" >&5
 $as_echo "$ac_cv_lib_lam_main" >&6; }
-if test "x$ac_cv_lib_lam_main" = x""yes; then :
+if test "x$ac_cv_lib_lam_main" = xyes; then :
   LAMOBJS=yap_mpi."$SO"
 else
   LAMOBJS=no
@@ -7608,7 +7529,7 @@ CC=${OLD_CC}
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for ANSI C header files" >&5
 $as_echo_n "checking for ANSI C header files... " >&6; }
-if test "${ac_cv_header_stdc+set}" = set; then :
+if ${ac_cv_header_stdc+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
@@ -7720,7 +7641,7 @@ fi
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for sys/wait.h that is POSIX.1 compatible" >&5
 $as_echo_n "checking for sys/wait.h that is POSIX.1 compatible... " >&6; }
-if test "${ac_cv_header_sys_wait_h+set}" = set; then :
+if ${ac_cv_header_sys_wait_h+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
@@ -7957,7 +7878,7 @@ done
 for ac_header in mach-o/dyld.h
 do :
   ac_fn_c_check_header_mongrel "$LINENO" "mach-o/dyld.h" "ac_cv_header_mach_o_dyld_h" "$ac_includes_default"
-if test "x$ac_cv_header_mach_o_dyld_h" = x""yes; then :
+if test "x$ac_cv_header_mach_o_dyld_h" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_MACH_O_DYLD_H 1
 _ACEOF
@@ -7971,7 +7892,7 @@ then
   for ac_header in gmp.h
 do :
   ac_fn_c_check_header_mongrel "$LINENO" "gmp.h" "ac_cv_header_gmp_h" "$ac_includes_default"
-if test "x$ac_cv_header_gmp_h" = x""yes; then :
+if test "x$ac_cv_header_gmp_h" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_GMP_H 1
 _ACEOF
@@ -7986,7 +7907,7 @@ then
   for ac_header in cudd.h
 do :
   ac_fn_c_check_header_mongrel "$LINENO" "cudd.h" "ac_cv_header_cudd_h" "$ac_includes_default"
-if test "x$ac_cv_header_cudd_h" = x""yes; then :
+if test "x$ac_cv_header_cudd_h" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_CUDD_H 1
 _ACEOF
@@ -8001,7 +7922,7 @@ then
   for ac_header in mysql/mysql.h
 do :
   ac_fn_c_check_header_mongrel "$LINENO" "mysql/mysql.h" "ac_cv_header_mysql_mysql_h" "$ac_includes_default"
-if test "x$ac_cv_header_mysql_mysql_h" = x""yes; then :
+if test "x$ac_cv_header_mysql_mysql_h" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_MYSQL_MYSQL_H 1
 _ACEOF
@@ -8016,7 +7937,7 @@ then
   for ac_header in readline/readline.h
 do :
   ac_fn_c_check_header_mongrel "$LINENO" "readline/readline.h" "ac_cv_header_readline_readline_h" "$ac_includes_default"
-if test "x$ac_cv_header_readline_readline_h" = x""yes; then :
+if test "x$ac_cv_header_readline_readline_h" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_READLINE_READLINE_H 1
 _ACEOF
@@ -8029,7 +7950,7 @@ fi
 for ac_header in mpi.h
 do :
   ac_fn_c_check_header_mongrel "$LINENO" "mpi.h" "ac_cv_header_mpi_h" "$ac_includes_default"
-if test "x$ac_cv_header_mpi_h" = x""yes; then :
+if test "x$ac_cv_header_mpi_h" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_MPI_H 1
 _ACEOF
@@ -8041,7 +7962,7 @@ done
 for ac_header in mpe.h
 do :
   ac_fn_c_check_header_mongrel "$LINENO" "mpe.h" "ac_cv_header_mpe_h" "$ac_includes_default"
-if test "x$ac_cv_header_mpe_h" = x""yes; then :
+if test "x$ac_cv_header_mpe_h" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_MPE_H 1
 _ACEOF
@@ -8053,7 +7974,7 @@ done
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for inline" >&5
 $as_echo_n "checking for inline... " >&6; }
-if test "${ac_cv_c_inline+set}" = set; then :
+if ${ac_cv_c_inline+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_cv_c_inline=no
@@ -8095,7 +8016,7 @@ esac
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether struct tm is in sys/time.h or time.h" >&5
 $as_echo_n "checking whether struct tm is in sys/time.h or time.h... " >&6; }
-if test "${ac_cv_struct_tm+set}" = set; then :
+if ${ac_cv_struct_tm+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
@@ -8134,7 +8055,7 @@ fi
 # This bug is HP SR number 8606223364.
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking size of int *" >&5
 $as_echo_n "checking size of int *... " >&6; }
-if test "${ac_cv_sizeof_int_p+set}" = set; then :
+if ${ac_cv_sizeof_int_p+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if ac_fn_c_compute_int "$LINENO" "(long int) (sizeof (int *))" "ac_cv_sizeof_int_p"        "$ac_includes_default"; then :
@@ -8167,7 +8088,7 @@ _ACEOF
 # This bug is HP SR number 8606223364.
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking size of short int" >&5
 $as_echo_n "checking size of short int... " >&6; }
-if test "${ac_cv_sizeof_short_int+set}" = set; then :
+if ${ac_cv_sizeof_short_int+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if ac_fn_c_compute_int "$LINENO" "(long int) (sizeof (short int))" "ac_cv_sizeof_short_int"        "$ac_includes_default"; then :
@@ -8200,7 +8121,7 @@ _ACEOF
 # This bug is HP SR number 8606223364.
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking size of int" >&5
 $as_echo_n "checking size of int... " >&6; }
-if test "${ac_cv_sizeof_int+set}" = set; then :
+if ${ac_cv_sizeof_int+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if ac_fn_c_compute_int "$LINENO" "(long int) (sizeof (int))" "ac_cv_sizeof_int"        "$ac_includes_default"; then :
@@ -8233,7 +8154,7 @@ _ACEOF
 # This bug is HP SR number 8606223364.
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking size of long int" >&5
 $as_echo_n "checking size of long int... " >&6; }
-if test "${ac_cv_sizeof_long_int+set}" = set; then :
+if ${ac_cv_sizeof_long_int+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if ac_fn_c_compute_int "$LINENO" "(long int) (sizeof (long int))" "ac_cv_sizeof_long_int"        "$ac_includes_default"; then :
@@ -8266,7 +8187,7 @@ _ACEOF
 # This bug is HP SR number 8606223364.
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking size of long long int" >&5
 $as_echo_n "checking size of long long int... " >&6; }
-if test "${ac_cv_sizeof_long_long_int+set}" = set; then :
+if ${ac_cv_sizeof_long_long_int+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if ac_fn_c_compute_int "$LINENO" "(long int) (sizeof (long long int))" "ac_cv_sizeof_long_long_int"        "$ac_includes_default"; then :
@@ -8299,7 +8220,7 @@ _ACEOF
 # This bug is HP SR number 8606223364.
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking size of float" >&5
 $as_echo_n "checking size of float... " >&6; }
-if test "${ac_cv_sizeof_float+set}" = set; then :
+if ${ac_cv_sizeof_float+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if ac_fn_c_compute_int "$LINENO" "(long int) (sizeof (float))" "ac_cv_sizeof_float"        "$ac_includes_default"; then :
@@ -8332,7 +8253,7 @@ _ACEOF
 # This bug is HP SR number 8606223364.
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking size of double" >&5
 $as_echo_n "checking size of double... " >&6; }
-if test "${ac_cv_sizeof_double+set}" = set; then :
+if ${ac_cv_sizeof_double+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   if ac_fn_c_compute_int "$LINENO" "(long int) (sizeof (double))" "ac_cv_sizeof_double"        "$ac_includes_default"; then :
@@ -8362,7 +8283,7 @@ _ACEOF
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for type of malloc" >&5
 $as_echo_n "checking for type of malloc... " >&6; }
-if test "${yap_cv_malloct+set}" = set; then :
+if ${yap_cv_malloct+:} false; then :
   $as_echo_n "(cached) " >&6
 else
 
@@ -8402,7 +8323,7 @@ fi
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for gcc inline" >&5
 $as_echo_n "checking for gcc inline... " >&6; }
-if test "${yap_cv_gcc+set}" = set; then :
+if ${yap_cv_gcc+:} false; then :
   $as_echo_n "(cached) " >&6
 else
 
@@ -8509,7 +8430,7 @@ fi
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for gcc threaded code" >&5
 $as_echo_n "checking for gcc threaded code... " >&6; }
-if test "${yap_cv_threaded_code+set}" = set; then :
+if ${yap_cv_threaded_code+:} false; then :
   $as_echo_n "(cached) " >&6
 else
 
@@ -8554,7 +8475,7 @@ fi
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for IEEE floats" >&5
 $as_echo_n "checking for IEEE floats... " >&6; }
-if test "${yap_cv_ffieee+set}" = set; then :
+if ${yap_cv_ffieee+:} false; then :
   $as_echo_n "(cached) " >&6
 else
 
@@ -8595,7 +8516,7 @@ fi
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for sigsetjmp" >&5
 $as_echo_n "checking for sigsetjmp... " >&6; }
-if test "${yap_cv_sigsetjmp+set}" = set; then :
+if ${yap_cv_sigsetjmp+:} false; then :
   $as_echo_n "(cached) " >&6
 else
 
@@ -8635,7 +8556,7 @@ fi
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for sigsegv" >&5
 $as_echo_n "checking for sigsegv... " >&6; }
-if test "${yap_cv_sigsegv+set}" = set; then :
+if ${yap_cv_sigsegv+:} false; then :
   $as_echo_n "(cached) " >&6
 else
 
@@ -8674,7 +8595,7 @@ fi
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for sigprof" >&5
 $as_echo_n "checking for sigprof... " >&6; }
-if test "${yap_cv_sigprof+set}" = set; then :
+if ${yap_cv_sigprof+:} false; then :
   $as_echo_n "(cached) " >&6
 else
 
@@ -8713,7 +8634,7 @@ fi
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for siginfo" >&5
 $as_echo_n "checking for siginfo... " >&6; }
-if test "${yap_cv_siginfo+set}" = set; then :
+if ${yap_cv_siginfo+:} false; then :
   $as_echo_n "(cached) " >&6
 else
 
@@ -8814,7 +8735,7 @@ fi
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking return type of signal handlers" >&5
 $as_echo_n "checking return type of signal handlers... " >&6; }
-if test "${ac_cv_type_signal+set}" = set; then :
+if ${ac_cv_type_signal+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
@@ -8956,7 +8877,7 @@ done
 for ac_func in mbsnrtowcs
 do :
   ac_fn_c_check_func "$LINENO" "mbsnrtowcs" "ac_cv_func_mbsnrtowcs"
-if test "x$ac_cv_func_mbsnrtowcs" = x""yes; then :
+if test "x$ac_cv_func_mbsnrtowcs" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_MBSNRTOWCS 1
 _ACEOF
@@ -9074,7 +8995,7 @@ done
 
 
 ac_fn_c_check_func "$LINENO" "regexec" "ac_cv_func_regexec"
-if test "x$ac_cv_func_regexec" = x""yes; then :
+if test "x$ac_cv_func_regexec" = xyes; then :
   NO_BUILTIN_REGEXP="#"
 else
   NO_BUILTIN_REGEXP=""
@@ -9084,7 +9005,7 @@ fi
 for ac_func in NSLinkModule
 do :
   ac_fn_c_check_func "$LINENO" "NSLinkModule" "ac_cv_func_NSLinkModule"
-if test "x$ac_cv_func_NSLinkModule" = x""yes; then :
+if test "x$ac_cv_func_NSLinkModule" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_NSLINKMODULE 1
 _ACEOF
@@ -9127,7 +9048,7 @@ fi
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for mpz_xor" >&5
 $as_echo_n "checking for mpz_xor... " >&6; }
-if test "${yap_cv_mpz_xor+set}" = set; then :
+if ${yap_cv_mpz_xor+:} false; then :
   $as_echo_n "(cached) " >&6
 else
 
@@ -9173,7 +9094,7 @@ fi
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking if fflush(NULL) clobbers input pipes" >&5
 $as_echo_n "checking if fflush(NULL) clobbers input pipes... " >&6; }
-if test "${yap_cv_broken_fflush_null+set}" = set; then :
+if ${yap_cv_broken_fflush_null+:} false; then :
   $as_echo_n "(cached) " >&6
 else
    cat >conftest.$ac_ext <<EOF
@@ -9284,13 +9205,13 @@ CLIB_PLTARGETS="\$(srcdir)/unix.pl $CLIB_PLTARGETS"
 CLIB_NETLIBS=
 else
 ac_fn_c_check_func "$LINENO" "socket" "ac_cv_func_socket"
-if test "x$ac_cv_func_socket" = x""yes; then :
+if test "x$ac_cv_func_socket" = xyes; then :
 
 else
 
              { $as_echo "$as_me:${as_lineno-$LINENO}: checking for socket in -lsocket" >&5
 $as_echo_n "checking for socket in -lsocket... " >&6; }
-if test "${ac_cv_lib_socket_socket+set}" = set; then :
+if ${ac_cv_lib_socket_socket+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -9324,7 +9245,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_socket_socket" >&5
 $as_echo "$ac_cv_lib_socket_socket" >&6; }
-if test "x$ac_cv_lib_socket_socket" = x""yes; then :
+if test "x$ac_cv_lib_socket_socket" = xyes; then :
   CLIB_NETLIBS="$CLIB_NETLIBS -lsocket"
 
 $as_echo "#define HAVE_LIBSOCKET 1" >>confdefs.h
@@ -9334,13 +9255,13 @@ fi
 fi
 
 ac_fn_c_check_func "$LINENO" "gethostent" "ac_cv_func_gethostent"
-if test "x$ac_cv_func_gethostent" = x""yes; then :
+if test "x$ac_cv_func_gethostent" = xyes; then :
 
 else
 
              { $as_echo "$as_me:${as_lineno-$LINENO}: checking for gethostent in -lnsl" >&5
 $as_echo_n "checking for gethostent in -lnsl... " >&6; }
-if test "${ac_cv_lib_nsl_gethostent+set}" = set; then :
+if ${ac_cv_lib_nsl_gethostent+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -9374,7 +9295,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nsl_gethostent" >&5
 $as_echo "$ac_cv_lib_nsl_gethostent" >&6; }
-if test "x$ac_cv_lib_nsl_gethostent" = x""yes; then :
+if test "x$ac_cv_lib_nsl_gethostent" = xyes; then :
   CLIB_NETLIBS="$CLIB_NETLIBS -lnsl"
 
 $as_echo "#define HAVE_LIBNSL 1" >>confdefs.h
@@ -9389,7 +9310,7 @@ fi
 oldlibs="$LIBS"
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for crypt in -lcrypt" >&5
 $as_echo_n "checking for crypt in -lcrypt... " >&6; }
-if test "${ac_cv_lib_crypt_crypt+set}" = set; then :
+if ${ac_cv_lib_crypt_crypt+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -9423,7 +9344,7 @@ LIBS=$ac_check_lib_save_LIBS
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_crypt_crypt" >&5
 $as_echo "$ac_cv_lib_crypt_crypt" >&6; }
-if test "x$ac_cv_lib_crypt_crypt" = x""yes; then :
+if test "x$ac_cv_lib_crypt_crypt" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_LIBCRYPT 1
 _ACEOF
@@ -9436,7 +9357,7 @@ CLIB_CRYPTLIBS="$LIBS"
 for ac_func in crypt
 do :
   ac_fn_c_check_func "$LINENO" "crypt" "ac_cv_func_crypt"
-if test "x$ac_cv_func_crypt" = x""yes; then :
+if test "x$ac_cv_func_crypt" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_CRYPT 1
 _ACEOF
@@ -9456,7 +9377,7 @@ ac_fn_c_check_type "$LINENO" "socklen_t" "ac_cv_type_socklen_t" "
 #include <sys/socket.h>
 
 "
-if test "x$ac_cv_type_socklen_t" = x""yes; then :
+if test "x$ac_cv_type_socklen_t" = xyes; then :
 
 cat >>confdefs.h <<_ACEOF
 #define HAVE_SOCKLEN_T 1
@@ -9470,7 +9391,7 @@ ac_fn_c_check_type "$LINENO" "ssize_t" "ac_cv_type_ssize_t" "
 #include <sys/socket.h>
 
 "
-if test "x$ac_cv_type_ssize_t" = x""yes; then :
+if test "x$ac_cv_type_ssize_t" = xyes; then :
 
 cat >>confdefs.h <<_ACEOF
 #define HAVE_SSIZE_T 1
@@ -9525,7 +9446,7 @@ fi
 
 ac_fn_c_check_member "$LINENO" "struct tm" "tm_gmtoff" "ac_cv_member_struct_tm_tm_gmtoff" "#include <time.h>
 "
-if test "x$ac_cv_member_struct_tm_tm_gmtoff" = x""yes; then :
+if test "x$ac_cv_member_struct_tm_tm_gmtoff" = xyes; then :
 
 $as_echo "#define HAVE_STRUCT_TIME_TM_GMTOFF /**/" >>confdefs.h
 
@@ -9776,10 +9697,21 @@ $as_echo "$as_me: WARNING: cache variable $ac_var contains a newline" >&2;} ;;
      :end' >>confcache
 if diff "$cache_file" confcache >/dev/null 2>&1; then :; else
   if test -w "$cache_file"; then
-    test "x$cache_file" != "x/dev/null" &&
+    if test "x$cache_file" != "x/dev/null"; then
       { $as_echo "$as_me:${as_lineno-$LINENO}: updating cache $cache_file" >&5
 $as_echo "$as_me: updating cache $cache_file" >&6;}
-    cat confcache >$cache_file
+      if test ! -f "$cache_file" || test -h "$cache_file"; then
+	cat confcache >"$cache_file"
+      else
+        case $cache_file in #(
+        */* | ?:*)
+	  mv -f confcache "$cache_file"$$ &&
+	  mv -f "$cache_file"$$ "$cache_file" ;; #(
+        *)
+	  mv -f confcache "$cache_file" ;;
+	esac
+      fi
+    fi
   else
     { $as_echo "$as_me:${as_lineno-$LINENO}: not updating unwritable cache $cache_file" >&5
 $as_echo "$as_me: not updating unwritable cache $cache_file" >&6;}
@@ -9811,7 +9743,7 @@ LTLIBOBJS=$ac_ltlibobjs
 
 
 
-: ${CONFIG_STATUS=./config.status}
+: "${CONFIG_STATUS=./config.status}"
 ac_write_fail=0
 ac_clean_files_save=$ac_clean_files
 ac_clean_files="$ac_clean_files $CONFIG_STATUS"
@@ -9912,6 +9844,7 @@ fi
 IFS=" ""	$as_nl"
 
 # Find who we are.  Look in the path if we contain no directory separator.
+as_myself=
 case $0 in #((
   *[\\/]* ) as_myself=$0 ;;
   *) as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
@@ -10219,7 +10152,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # values after options handling.
 ac_log="
 This file was extended by $as_me, which was
-generated by GNU Autoconf 2.67.  Invocation command line was
+generated by GNU Autoconf 2.68.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
   CONFIG_HEADERS  = $CONFIG_HEADERS
@@ -10281,7 +10214,7 @@ cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
 ac_cs_version="\\
 config.status
-configured by $0, generated by GNU Autoconf 2.67,
+configured by $0, generated by GNU Autoconf 2.68,
   with options \\"\$ac_cs_config\\"
 
 Copyright (C) 2010 Free Software Foundation, Inc.
@@ -10468,9 +10401,10 @@ fi
 # after its creation but before its name has been assigned to `$tmp'.
 $debug ||
 {
-  tmp=
+  tmp= ac_tmp=
   trap 'exit_status=$?
-  { test -z "$tmp" || test ! -d "$tmp" || rm -fr "$tmp"; } && exit $exit_status
+  : "${ac_tmp:=$tmp}"
+  { test ! -d "$ac_tmp" || rm -fr "$ac_tmp"; } && exit $exit_status
 ' 0
   trap 'as_fn_exit 1' 1 2 13 15
 }
@@ -10478,12 +10412,13 @@ $debug ||
 
 {
   tmp=`(umask 077 && mktemp -d "./confXXXXXX") 2>/dev/null` &&
-  test -n "$tmp" && test -d "$tmp"
+  test -d "$tmp"
 }  ||
 {
   tmp=./conf$$-$RANDOM
   (umask 077 && mkdir "$tmp")
 } || as_fn_error $? "cannot create a temporary directory in ." "$LINENO" 5
+ac_tmp=$tmp
 
 # Set up the scripts for CONFIG_FILES section.
 # No need to generate them if there are no CONFIG_FILES.
@@ -10505,7 +10440,7 @@ else
   ac_cs_awk_cr=$ac_cr
 fi
 
-echo 'BEGIN {' >"$tmp/subs1.awk" &&
+echo 'BEGIN {' >"$ac_tmp/subs1.awk" &&
 _ACEOF
 
 
@@ -10533,7 +10468,7 @@ done
 rm -f conf$$subs.sh
 
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
-cat >>"\$tmp/subs1.awk" <<\\_ACAWK &&
+cat >>"\$ac_tmp/subs1.awk" <<\\_ACAWK &&
 _ACEOF
 sed -n '
 h
@@ -10581,7 +10516,7 @@ t delim
 rm -f conf$$subs.awk
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 _ACAWK
-cat >>"\$tmp/subs1.awk" <<_ACAWK &&
+cat >>"\$ac_tmp/subs1.awk" <<_ACAWK &&
   for (key in S) S_is_set[key] = 1
   FS = ""
 
@@ -10613,7 +10548,7 @@ if sed "s/$ac_cr//" < /dev/null > /dev/null 2>&1; then
   sed "s/$ac_cr\$//; s/$ac_cr/$ac_cs_awk_cr/g"
 else
   cat
-fi < "$tmp/subs1.awk" > "$tmp/subs.awk" \
+fi < "$ac_tmp/subs1.awk" > "$ac_tmp/subs.awk" \
   || as_fn_error $? "could not setup config files machinery" "$LINENO" 5
 _ACEOF
 
@@ -10647,7 +10582,7 @@ fi # test -n "$CONFIG_FILES"
 # No need to generate them if there are no CONFIG_HEADERS.
 # This happens for instance with `./config.status Makefile'.
 if test -n "$CONFIG_HEADERS"; then
-cat >"$tmp/defines.awk" <<\_ACAWK ||
+cat >"$ac_tmp/defines.awk" <<\_ACAWK ||
 BEGIN {
 _ACEOF
 
@@ -10659,8 +10594,8 @@ _ACEOF
 # handling of long lines.
 ac_delim='%!_!# '
 for ac_last_try in false false :; do
-  ac_t=`sed -n "/$ac_delim/p" confdefs.h`
-  if test -z "$ac_t"; then
+  ac_tt=`sed -n "/$ac_delim/p" confdefs.h`
+  if test -z "$ac_tt"; then
     break
   elif $ac_last_try; then
     as_fn_error $? "could not make $CONFIG_HEADERS" "$LINENO" 5
@@ -10780,7 +10715,7 @@ do
     for ac_f
     do
       case $ac_f in
-      -) ac_f="$tmp/stdin";;
+      -) ac_f="$ac_tmp/stdin";;
       *) # Look for the file first in the build tree, then in the source tree
 	 # (if the path is not absolute).  The absolute path cannot be DOS-style,
 	 # because $ac_f cannot contain `:'.
@@ -10815,7 +10750,7 @@ $as_echo "$as_me: creating $ac_file" >&6;}
     esac
 
     case $ac_tag in
-    *:-:* | *:-) cat >"$tmp/stdin" \
+    *:-:* | *:-) cat >"$ac_tmp/stdin" \
       || as_fn_error $? "could not create $ac_file" "$LINENO" 5 ;;
     esac
     ;;
@@ -10946,21 +10881,22 @@ s&@abs_top_builddir@&$ac_abs_top_builddir&;t t
 s&@INSTALL@&$ac_INSTALL&;t t
 $ac_datarootdir_hack
 "
-eval sed \"\$ac_sed_extra\" "$ac_file_inputs" | $AWK -f "$tmp/subs.awk" >$tmp/out \
-  || as_fn_error $? "could not create $ac_file" "$LINENO" 5
+eval sed \"\$ac_sed_extra\" "$ac_file_inputs" | $AWK -f "$ac_tmp/subs.awk" \
+  >$ac_tmp/out || as_fn_error $? "could not create $ac_file" "$LINENO" 5
 
 test -z "$ac_datarootdir_hack$ac_datarootdir_seen" &&
-  { ac_out=`sed -n '/\${datarootdir}/p' "$tmp/out"`; test -n "$ac_out"; } &&
-  { ac_out=`sed -n '/^[	 ]*datarootdir[	 ]*:*=/p' "$tmp/out"`; test -z "$ac_out"; } &&
+  { ac_out=`sed -n '/\${datarootdir}/p' "$ac_tmp/out"`; test -n "$ac_out"; } &&
+  { ac_out=`sed -n '/^[	 ]*datarootdir[	 ]*:*=/p' \
+      "$ac_tmp/out"`; test -z "$ac_out"; } &&
   { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $ac_file contains a reference to the variable \`datarootdir'
 which seems to be undefined.  Please make sure it is defined" >&5
 $as_echo "$as_me: WARNING: $ac_file contains a reference to the variable \`datarootdir'
 which seems to be undefined.  Please make sure it is defined" >&2;}
 
-  rm -f "$tmp/stdin"
+  rm -f "$ac_tmp/stdin"
   case $ac_file in
-  -) cat "$tmp/out" && rm -f "$tmp/out";;
-  *) rm -f "$ac_file" && mv "$tmp/out" "$ac_file";;
+  -) cat "$ac_tmp/out" && rm -f "$ac_tmp/out";;
+  *) rm -f "$ac_file" && mv "$ac_tmp/out" "$ac_file";;
   esac \
   || as_fn_error $? "could not create $ac_file" "$LINENO" 5
  ;;
@@ -10971,20 +10907,20 @@ which seems to be undefined.  Please make sure it is defined" >&2;}
   if test x"$ac_file" != x-; then
     {
       $as_echo "/* $configure_input  */" \
-      && eval '$AWK -f "$tmp/defines.awk"' "$ac_file_inputs"
-    } >"$tmp/config.h" \
+      && eval '$AWK -f "$ac_tmp/defines.awk"' "$ac_file_inputs"
+    } >"$ac_tmp/config.h" \
       || as_fn_error $? "could not create $ac_file" "$LINENO" 5
-    if diff "$ac_file" "$tmp/config.h" >/dev/null 2>&1; then
+    if diff "$ac_file" "$ac_tmp/config.h" >/dev/null 2>&1; then
       { $as_echo "$as_me:${as_lineno-$LINENO}: $ac_file is unchanged" >&5
 $as_echo "$as_me: $ac_file is unchanged" >&6;}
     else
       rm -f "$ac_file"
-      mv "$tmp/config.h" "$ac_file" \
+      mv "$ac_tmp/config.h" "$ac_file" \
 	|| as_fn_error $? "could not create $ac_file" "$LINENO" 5
     fi
   else
     $as_echo "/* $configure_input  */" \
-      && eval '$AWK -f "$tmp/defines.awk"' "$ac_file_inputs" \
+      && eval '$AWK -f "$ac_tmp/defines.awk"' "$ac_file_inputs" \
       || as_fn_error $? "could not create -" "$LINENO" 5
   fi
  ;;
diff --git a/configure.in b/configure.in
index 089708538..652347c1c 100755
--- a/configure.in
+++ b/configure.in
@@ -610,14 +610,15 @@ fi
 
 if test "$yap_cv_readline" != "no"
 then
-  AC_CHECK_LIB(termcap,tgetent)
-  case "$target_os" in
-    *darwin*)
-    ;;
-    *)
-    AC_CHECK_LIB(ncurses,main)
-  esac
-  AC_CHECK_LIB(readline,readline)
+  AC_CHECK_LIB([readline], [main],[
+                AC_DEFINE([HAVE_LIBREADLINE], [1],[Define if you have libreadline])
+		LIBS="$LIBS -lreadline -lncurses"
+              ],
+              [if test "x$with_readline" != xcheck; then
+                 AC_MSG_FAILURE(
+                   [--with-readline was given, but test for readline failed])
+               fi
+              ], -lncurses)
 fi
 if test "$yap_cv_gmp" != "no"
 then