regex: port to non-glibc/lock-using systems

[gnulib.git] / m4 / regex.m4

diff --git a/m4/regex.m4 b/m4/regex.m4
index 6d29dcf..0945c11 100644 (file)
--- a/m4/regex.m4
+++ b/m4/regex.m4
@@ -266,6 +266,7 @@ AC_DEFUN([gl_PREREQ_REGEX],
   AC_REQUIRE([AC_C_RESTRICT])
   AC_REQUIRE([AC_TYPE_MBSTATE_T])
   AC_REQUIRE([gl_EEMALLOC])
+  AC_REQUIRE([gl_GLIBC21])
   AC_CHECK_HEADERS([libintl.h])
   AC_CHECK_FUNCS_ONCE([isblank iswctype wcscoll])
   AC_CHECK_DECLS([isblank], [], [], [[#include <ctype.h>]])