configure.ac: Fix portability of test(1) expression for C99 support

The == operator is non-standard, use = instead.

[ bvanassche: added "configure.ac: " prefix in front of patch subject ]

diff --git a/configure.ac b/configure.ac
index b2f3dd91dbcb60d42fa292fb45df0b821eeb2069..4582fb5d094d3f3b31b0c077029d4f066e60047d 100755 (executable)
--- a/configure.ac
+++ b/configure.ac
@@ -115,7 +115,7 @@ rm $tmpfile
 
 # Make sure we can compile in C99 mode.
 AC_PROG_CC_C99
-if test "$ac_cv_prog_cc_c99" == "no"; then
+if test "$ac_cv_prog_cc_c99" = "no"; then
     AC_MSG_ERROR([Valgrind relies on a C compiler supporting C99])
 fi