Needs <ctype.h>, <stdio.h> and <stdlib.h> for isdigit, snprintf and strtoul

respectively.

#error if ISC_PLATFORM_NEEDVSNPRINTF is not defined.

lib/isc/print.c

@@ -17,10 +17,18 @@
 
 #include <config.h>
 
+#include <ctype.h>
+#include <stdio.h>		/* for sprintf */
+#include <stdlib.h>
+
 #include <isc/assertions.h>
 #include <isc/print.h>
 #include <isc/platform.h>
 
+#ifndef ISC_PLATFORM_NEEDVSNPRINTF
+#error ISC_PLATFORM_NEEDVSPRINTF needs to be defined to compile this file.
+#endif
+
 /*
  * Return length of string that would have been written if not truncated.
  */