# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
-# serial 10
+# serial 11
# Written by Paul Eggert.
AC_REQUIRE([AC_C_RESTRICT])
AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
gl_CHECK_NEXT_HEADERS([string.h])
+
+ dnl Check for declarations of anything we want to poison if the
+ dnl corresponding gnulib module is not in use, and which is not
+ dnl guaranteed by C89.
+ gl_WARN_ON_USE_PREPARE([[#include <string.h>
+ ]], [memmem mempcpy memrchr rawmemchr stpcpy stpncpy strchrnul strdup
+ strndup strnlen strpbrk strsep strcasestr strtok_r strsignal strverscmp])
])
AC_DEFUN([gl_STRING_MODULE_INDICATOR],