Whoops, these are for all !_WIN32 and some _WIN32

src/xpdev/genwrap.c

@@ -671,8 +671,7 @@ long xp_random(int n)
 /* There may be a native GNU C Library function to this...					*/
 /****************************************************************************/
 #if !defined(_MSC_VER) && !defined(__BORLANDC__) && !defined(__WATCOMC__)
-#ifdef __GNUC__
-#if (__GNUC__ < 5)
+#if (defined(__GNUC__) && (__GNUC__ > 4)) || !defined(__MINGW32__)
 char* ultoa(ulong val, char* str, int radix)
 {
 	switch(radix) {
@@ -731,7 +730,6 @@ char* _ui64toa(uint64_t val, char* str, int radix)
 }
 #endif
 #endif
-#endif
 
 /****************************************************************************/
 /* Write the version details of the current operating system into str		*/

src/xpdev/genwrap.h

@@ -232,14 +232,12 @@ extern "C" {
 #endif
 
 #if !defined(_MSC_VER) && !defined(__BORLANDC__) && !defined(__WATCOMC__)
-#ifdef __GNUC__
-#if (__GNUC__ < 5)
+#if (defined(__GNUC__) && (__GNUC__ > 4)) || !defined(__MINGW32__)
 	DLLEXPORT char* ultoa(ulong, char*, int radix);
 	DLLEXPORT char* _i64toa(int64_t, char*, int radix);
 	DLLEXPORT char* _ui64toa(uint64_t, char*, int radix);
 #endif
 #endif
-#endif
 
 #if defined(__unix__)
 	DLLEXPORT char*	strupr(char* str);