#define _flsbuf(c,f) _CANNOT _flsbuf_
#define fdopen(fd,p) _CANNOT _fdopen_
#define fileno(f) _CANNOT _fileno_
-#if SFIO_VERSION < 20000101L
+#if defined(SFIO_VERSION) && SFIO_VERSION < 20000101L
#define flockfile(f) _CANNOT _flockfile_
#define ftrylockfile(f) _CANNOT _ftrylockfile_
#define funlockfile(f) _CANNOT _funlockfile_