Issue #13057: Include stdio.h when NULL is used in configure.ac.
diff --git a/configure b/configure
index 4a861ed..534c8df 100755
--- a/configure
+++ b/configure
@@ -6562,6 +6562,7 @@
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
+#include <stdio.h>
#include <pthread.h>
void* routine(void* p){return NULL;}
@@ -6617,6 +6618,7 @@
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
+#include <stdio.h>
#include <pthread.h>
void* routine(void* p){return NULL;}
@@ -6666,6 +6668,7 @@
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
+#include <stdio.h>
#include <pthread.h>
void* routine(void* p){return NULL;}
@@ -6715,6 +6718,7 @@
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
+#include <stdio.h>
#include <pthread.h>
void* routine(void* p){return NULL;}
@@ -9323,6 +9327,8 @@
$as_echo_n "checking for pthread_create in -lpthread... " >&6; }
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
+
+#include <stdio.h>
#include <pthread.h>
void * start_routine (void *arg) { exit (0); }
@@ -9672,7 +9678,9 @@
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;
}