From fc54ce39f7b98d3753968ee825816e2c49407ab1 Mon Sep 17 00:00:00 2001
From: Nikita Popov <nikita.ppv@gmail.com>
Date: Mon, 5 Oct 2020 10:51:34 +0200
Subject: [PATCH] Fix -Wimplicit-function-declaration in configure

---
 config.m4 | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/config.m4 b/config.m4
index 483f9743..85704ce0 100644
--- a/config.m4
+++ b/config.m4
@@ -92,7 +92,8 @@ if test "$PHP_APCU" != "no"; then
 	    AC_RUN_IFELSE([AC_LANG_SOURCE([[
 			    #include <sys/types.h>
 			    #include <pthread.h>
-          main() {
+                #include <stdio.h>
+          int main() {
 			      pthread_rwlock_t rwlock;
 			      pthread_rwlockattr_t attr;	
 
@@ -143,7 +144,8 @@ if test "$PHP_APCU" != "no"; then
 	  AC_RUN_IFELSE([AC_LANG_SOURCE([[
 				  #include <sys/types.h>
 				  #include <pthread.h>
-          main() {
+                  #include <stdio.h>
+          int main() {
 				    pthread_mutex_t mutex;
 				    pthread_mutexattr_t attr;