--- configure.ac.orig	2008-11-19 09:57:26.000000000 +0100
+++ configure.ac	2008-11-19 09:59:08.000000000 +0100
@@ -435,10 +437,10 @@
 AC_ARG_WITH(combined-threads, [AC_HELP_STRING([--with-combined-threads],[combine threads into main libfftw3])], with_combined_threads=$withval, with_combined_threads=no)
 
 if test "$enable_openmp"x != nox; then
-   AX_OPENMP([THREADLIBS=" "
+   AX_OPENMP([THREADLIBS="$OPENMP_LIBS"
      AC_DEFINE(USING_OPENMP_THREADS, 1, [Define if we have and are using OpenMP multithreading directives])
      CFLAGS="$CFLAGS $OPENMP_CFLAGS"],
-     [AC_MSG_ERROR([don't know how to enable OpenMP])])
+     [AC_MSG_WARN([don't know how to enable OpenMP, reverting to POSIX threads])])
 fi
 
 dnl Check for threads library...
--- m4/ax_openmp.m4.orig	2008-07-10 11:33:17.361562576 +0100
+++ m4/ax_openmp.m4	2008-07-10 12:05:14.280159723 +0100
@@ -59,6 +59,10 @@
 else
   if test "x$ax_cv_[]_AC_LANG_ABBREV[]_openmp" != "xnone"; then
     OPENMP_[]_AC_LANG_PREFIX[]FLAGS=$ax_cv_[]_AC_LANG_ABBREV[]_openmp
+    OPENMP_LIBS=" "
+    if test "x$ax_cv_[]_AC_LANG_ABBREV[]_openmp" = "x-fopenmp"; then
+        OPENMP_LIBS="-lgomp"
+    fi
   fi
   m4_default([$1], [AC_DEFINE(HAVE_OPENMP,1,[Define if OpenMP is enabled])])
 fi