clean up makefile

packages/gecode/configure.in

@@ -20,11 +20,11 @@ AC_ARG_ENABLE(gecode,
          fi], use_gecode=$have_gecode)
 
 if test "$use_gecode" = no; then
-  ENABLE_GECODE="@# "
+  PKG_GECODE=""
 else
-  ENABLE_GECODE=""
+  PKG_GECODE="packages/gecode"
 fi
-AC_SUBST(ENABLE_GECODE)
+AC_SUBST(PKG_GECODE)
 
 AC_MSG_CHECKING([if dynamic arrays are supported])
 
@@ -90,3 +90,8 @@ fi
 
 AC_SUBST(GECODE_VERSION)
 AC_SUBST(GECODE_EXTRALIBS)
+
+if test "$PKG_GECODE" = "packages/gecode"; then
+AC_CONFIG_FILES([packages/gecode/Makefile])
+fi
+