Issue #13057: Include stdio.h when NULL is used in configure.ac.
diff --git a/configure b/configure
index 494bef9..40f37de 100755
--- a/configure
+++ b/configure
@@ -5850,6 +5850,7 @@
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
+#include <stdio.h>
#include <pthread.h>
void* routine(void* p){return NULL;}
@@ -5905,6 +5906,7 @@
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
+#include <stdio.h>
#include <pthread.h>
void* routine(void* p){return NULL;}
@@ -5954,6 +5956,7 @@
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
+#include <stdio.h>
#include <pthread.h>
void* routine(void* p){return NULL;}
@@ -6003,6 +6006,7 @@
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
+#include <stdio.h>
#include <pthread.h>
void* routine(void* p){return NULL;}
@@ -8690,6 +8694,8 @@
$as_echo_n "checking for pthread_create in -lpthread... " >&6; }
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
+
+#include <stdio.h>
#include <pthread.h>
void * start_routine (void *arg) { exit (0); }
@@ -9082,7 +9088,9 @@
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
-#include <pthread.h>
+
+ #include <stdio.h>
+ #include <pthread.h>
void *foo(void *parm) {
return NULL;
}