For NULL, include <stdlib.h>, not <stdio.h>.

diff --git a/m4/strtok_r.m4 b/m4/strtok_r.m4
index fd52317..0e4acb9 100644 (file)
--- a/m4/strtok_r.m4
+++ b/m4/strtok_r.m4
@@ -26,7 +26,7 @@ AC_DEFUN([gl_FUNC_STRTOK_R],
               #endif
               #undef __OPTIMIZE_SIZE__
               #undef __NO_INLINE__
-              #include <stdio.h>
+              #include <stdlib.h>
               #include <string.h>
             ]],
             [[char delimiters[] = "xxxxxxxx";