Avoid depending on a header file for the definition of NULL

diff --git a/acinclude.m4 b/acinclude.m4
index fe62273f206e33645e7e68c94809e76028899016..0c34a8c8d384f6c3b0c4e6cbf89b4f3fdbfadc52 100644 (file)
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -181,10 +181,12 @@ AC_DEFUN([CURL_CHECK_HEADER_WINLDAP], [
     AC_COMPILE_IFELSE([
       AC_LANG_PROGRAM([
 #undef inline
+#ifdef HAVE_WINDOWS_H
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
 #include <windows.h>
+#endif
 #include <winldap.h>
       ],[
 #ifdef __CYGWIN__
@@ -219,10 +221,12 @@ AC_DEFUN([CURL_CHECK_HEADER_WINBER], [
     AC_COMPILE_IFELSE([
       AC_LANG_PROGRAM([
 #undef inline
+#ifdef HAVE_WINDOWS_H
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
 #include <windows.h>
+#endif
 #include <winldap.h>
 #include <winber.h>
       ],[
@@ -266,11 +270,13 @@ AC_DEFUN([CURL_CHECK_HEADER_LBER], [
 #endif
 #include <windows.h>
 #else
-#include <stddef.h>
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 #endif
+#ifndef NULL
+#define NULL (void *)0
+#endif
 #include <lber.h>
       ],[
         BerValue *bvp = NULL;
@@ -296,11 +302,13 @@ AC_DEFUN([CURL_CHECK_HEADER_LBER], [
 #endif
 #include <windows.h>
 #else
-#include <stddef.h>
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 #endif
+#ifndef NULL
+#define NULL (void *)0
+#endif
 #ifndef LDAP_DEPRECATED
 #define LDAP_DEPRECATED 1
 #endif
@@ -436,11 +444,13 @@ AC_DEFUN([CURL_CHECK_HEADER_LDAPSSL], [
 #endif
 #include <windows.h>
 #else
-#include <stddef.h>
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 #endif
+#ifndef NULL
+#define NULL (void *)0
+#endif
 #ifndef LDAP_DEPRECATED
 #define LDAP_DEPRECATED 1
 #endif
@@ -498,11 +508,13 @@ AC_DEFUN([CURL_CHECK_LIBS_LDAP], [
 #endif
 #include <windows.h>
 #else
-#include <stddef.h>
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 #endif
+#ifndef NULL
+#define NULL (void *)0
+#endif
 #ifndef LDAP_DEPRECATED
 #define LDAP_DEPRECATED 1
 #endif
@@ -1689,10 +1701,12 @@ dnl
 AC_DEFUN([CURL_CHECK_WORKING_RESOLVER],[
 AC_MSG_CHECKING([if "localhost" resolves])
 AC_TRY_RUN([
-#include <stddef.h>
 #include <string.h>
 #include <sys/types.h>
 #include <netdb.h>
+#ifndef NULL
+#define NULL (void *)0
+#endif
 
 int
 main () {