+/* STRSIGNAL */
+#ifndef HAVE_STRSIGNAL
+#define STRSIGNAL(x) "[platform has no strsignal!]"
+#endif
+
+/* VSNPRINTF */
+#ifndef HAVE_VSNPRINTF
+# error "You must have vsnprintf! Without vsnprintf it is very hard to write secure programs. If you don't have it then your system libc is probably full of hideous buffer overrun security bugs. But, if you don't want to fix your system a portable snprintf can be found at http://www.ijs.si/software/snprintf/"
+#endif
+