+dnl ** check for mingwex library
+AC_CHECK_LIB(mingwex, closedir, HaveLibMingwEx=YES, HaveLibMingwEx=NO)
+AC_SUBST(HaveLibMingwEx)
+
+if test $HaveLibMingwEx = YES ; then
+ AC_DEFINE(HAVE_MINGWEX)
+fi
+
+if test "$HaveLibGmp" = "NO"; then
+if test "$HostArch_CPP" = "ia64"; then
+AC_MSG_ERROR([You need to install libgmp (the in-tree version does not work on IA64).])
+fi;
+fi;
+