* wcwidth.m4 (gl_FUNC_WCWIDTH): Simplify by using AC_CHECK_DECLS.

[gnulib.git] / lib / strstr.c

diff --git a/lib/strstr.c b/lib/strstr.c
index 3faae01..e94cef7 100644 (file)
--- a/lib/strstr.c
+++ b/lib/strstr.c
@@ -16,13 +16,15 @@
    along with this program; if not, write to the Free Software Foundation,
    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
 
-#if HAVE_CONFIG_H
+#ifdef HAVE_CONFIG_H
 # include <config.h>
 #endif
 
 /* Specification.  */
 #include "strstr.h"
 
+#include <stddef.h>  /* for NULL */
+
 #if HAVE_MBRTOWC
 # include "mbuiter.h"
 #endif