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-rw-r--r--configure.ac2
1 files changed, 1 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac
index b24a8f59b0..c7059ee1ec 100644
--- a/configure.ac
+++ b/configure.ac
@@ -218,7 +218,7 @@ rb_test_CXXFLAGS=${CXXFLAGS+yes}
# BSD's ports and MacPorts prefix GNU binutils with 'g'
dnl Seems necessarily in order to add -std=gnu99 option for gcc 4.9.
-m4_version_prereq([2.70], [], [AC_PROG_CC_C99])
+m4_version_prereq([2.70], [AC_PROG_CC], [AC_PROG_CC_C99])
AC_PROG_CXX
AC_PROG_CPP