From 2d7d77e9a6b1be27cf4a4d92f52eded61f1011e7 Mon Sep 17 00:00:00 2001
From: rlar <rlar>
Date: Sat, 15 Dec 2012 21:40:21 +0100
Subject: [PATCH] configure.ac, defensive use of `AC_OPENMP'

---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index f0c83767e..c7ea318d4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -991,7 +991,7 @@ AC_ARG_ENABLE([openmp],
 
 # Add OpenMP to ngspice.
 : ${enable_openmp:=no}
-AC_OPENMP
+m4_ifdef([AC_OPENMP], [AC_OPENMP])
 
 if test "x$enable_openmp" = xyes; then
     AC_DEFINE([USE_OMP], [1], [OpenMP parallel processing])