configure.ac, defensive use of `AC_OPENMP'

13 years ago · 2d7d77e9a6
1 changed files with 1 additions and 1 deletions
--- 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])