ultoa is not declared in all Win32 C libraries (MinGW for example).

src/sbbs3/sbbswrap.h

@@ -83,7 +83,6 @@ extern "C" {
 
 	DLLEXPORT void	sbbs_beep(int freq, int dur);
 	DLLEXPORT long	filelength(int fd);
-	DLLEXPORT char* ultoa(ulong, char*, int radix);
 	DLLEXPORT char*	strupr(char* str);
 	DLLEXPORT char*	strlwr(char* str);
 
@@ -111,6 +110,12 @@ extern "C" {
 	#define _chmod(p,f,a)		_rtl_chmod(p,f,a) 	/* _chmod obsolete in 4.x */
 #endif
 
+#if !defined _MSC_VER && !defined __BORLANDC__
+DLLEXPORT char* ultoa(ulong, char*, int radix);
+#endif
+
+
+/* General file system wrappers for all platforms and compilers */
 DLLEXPORT BOOL		fexist(char *filespec);
 DLLEXPORT long		flength(char *filename);
 DLLEXPORT long		fdate(char *filename);

src/sbbs3/wrappers.c

@@ -186,7 +186,7 @@ int sbbs_random(int n)
 /* Return ASCII string representation of ulong								*/
 /* There may be a native GNU C Library function to this...					*/
 /****************************************************************************/
-#ifdef __unix__
+#if !defined _MSC_VER && !defined __BORLANDC__
 char* ultoa(ulong val, char* str, int radix)
 {
 	switch(radix) {