* if libltdl fails to configure, abort the configure process. We don't have the

ability at this point to roll back and build without libltdl if we thought we
  we going to have libltdl (we can configure without libltdl if we know from
  the start it won't be there, from --disable-dlopen).

This commit was SVN r8336.

configure.ac

@@ -1474,9 +1474,10 @@ if test "$OMPI_ENABLE_DLOPEN_SUPPORT" = "1" ; then
         WRAPPER_EXTRA_LIBS="$WRAPPER_EXTRA_LIBS $extra_ldflags"
         LDFLAGS="-export-dynamic $LDFLAGS"
     else
-        LIBLTDL_SUBDIR=
-        LIBLTDL_LTLIB=
-        WANT_LIBLTDL=0
+        AC_MSG_ERROR([Failed to build GNU libltdl.  This usually means that something
+is incorrectly setup with your environment.  There may be useful information in
+opal/libltdl/config.log.  You can also disable GNU libltdl (which will disable
+dynamic shared object loading) by configuring with --disable-dlopen.])
     fi
     CFLAGS="$CFLAGS_save"
 else