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-rw-r--r--lib/replace/autoconf-2.60.m42
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/replace/autoconf-2.60.m4 b/lib/replace/autoconf-2.60.m4
index acdcd38efe..2d5dbc1661 100644
--- a/lib/replace/autoconf-2.60.m4
+++ b/lib/replace/autoconf-2.60.m4
@@ -179,6 +179,7 @@ AC_DEFUN([AC_PROG_CC_C99],
# ------------------------
# Enable extensions on systems that normally disable them,
# typically due to standards-conformance issues.
+m4_ifndef([AC_USE_SYSTEM_EXTENSIONS],[
AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS],
[
AC_BEFORE([$0], [AC_COMPILE_IFELSE])
@@ -208,3 +209,4 @@ AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS],
AC_DEFINE([__EXTENSIONS__])
AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
])
+])