diff --git a/H/Foreign.h b/H/Foreign.h
index 6013836b9..c77c83161 100644
--- a/H/Foreign.h
+++ b/H/Foreign.h
@@ -75,7 +75,9 @@
 #ifdef NO_DYN
 #undef NO_DYN
 #endif
+#if !HAVE_DLOPEN
 #define LOAD_DYLD 1
+#endif
 #endif /* LOAD_DYLD */
 
 extern char LoadMsg[];
diff --git a/configure b/configure
index 508c1d0f1..682b0ce16 100755
--- a/configure
+++ b/configure
@@ -855,6 +855,7 @@ Optional Features:
  --enable-use-malloc    use malloc to allocate memory
  --enable-condor    allow Yap to be used from condor
  --enable-april    compile Yap to support April ILP system
+ --enable-dlcompat    use dlcompat library for dynamic loading on Mac OS X
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
@@ -2172,6 +2173,14 @@ else
   use_april=no
 fi;
 
+# Check whether --enable-dlcompat or --disable-dlcompat was given.
+if test "${enable_dlcompat+set}" = set; then
+  enableval="$enable_dlcompat"
+  use_dlcompat="$enableval"
+else
+  use_dlcompat=no
+fi;
+
 
 # Check whether --with-gmp or --without-gmp was given.
 if test "${with_gmp+set}" = set; then
@@ -4701,6 +4710,69 @@ fi
 	INSTALL_DLLS=""
 	;;
       *darwin*)
+	if test ${use_dlcompat} = yes
+	then
+	  echo "$as_me:$LINENO: checking for dlopen in -ldl" >&5
+echo $ECHO_N "checking for dlopen in -ldl... $ECHO_C" >&6
+if test "${ac_cv_lib_dl_dlopen+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-ldl  $LIBS"
+cat >conftest.$ac_ext <<_ACEOF
+#line $LINENO "configure"
+#include "confdefs.h"
+
+/* Override any gcc2 internal prototype to avoid an error.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+/* We use char because int might match the return type of a gcc2
+   builtin and then its argument prototype would still apply.  */
+char dlopen ();
+int
+main ()
+{
+dlopen ();
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+  (eval $ac_link) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+         { ac_try='test -s conftest$ac_exeext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_lib_dl_dlopen=yes
+else
+  echo "$as_me: failed program was:" >&5
+cat conftest.$ac_ext >&5
+ac_cv_lib_dl_dlopen=no
+fi
+rm -f conftest.$ac_objext conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+echo "$as_me:$LINENO: result: $ac_cv_lib_dl_dlopen" >&5
+echo "${ECHO_T}$ac_cv_lib_dl_dlopen" >&6
+if test $ac_cv_lib_dl_dlopen = yes; then
+  have_dl=yes
+
+else
+  have_dl=no
+fi
+
+	  if test ${have_dl} = yes
+	  then
+	    LIBS="$LIBS -ldl"
+	  fi
+	fi
 	SHLIB_CFLAGS="-fno-common"
 	SHLIB_SUFFIX=".so"
         DO_SECOND_LD=""
diff --git a/configure.in b/configure.in
index 4dc465793..ae8007782 100644
--- a/configure.in
+++ b/configure.in
@@ -58,6 +58,10 @@ AC_ARG_ENABLE(condor,
 AC_ARG_ENABLE(april,
 	[ --enable-april    compile Yap to support April ILP system],
 	use_april="$enableval", use_april=no)
+
+AC_ARG_ENABLE(dlcompat,
+	[ --enable-dlcompat    use dlcompat library for dynamic loading on Mac OS X],
+	use_dlcompat="$enableval", use_dlcompat=no)
 	
 AC_ARG_WITH(gmp,
 	[ --with-gmp[=DIR]           use GNU Multiple Precision in DIR],
@@ -515,6 +519,17 @@ dnl Linux has both elf and a.out, in this case we found elf
 	INSTALL_DLLS=""
 	;;
       *darwin*)
+	if test ${use_dlcompat} = yes
+	then
+	  AC_CHECK_LIB(dl,dlopen,
+	     have_dl=yes
+	   ,
+	     have_dl=no)
+	  if test ${have_dl} = yes
+	  then
+	    LIBS="$LIBS -ldl"	  
+	  fi
+	fi
 	SHLIB_CFLAGS="-fno-common"
 	SHLIB_SUFFIX=".so"
         DO_SECOND_LD=""