-# define flock(fd,op) \
- (GL_LINK_WARNING ("flock is unportable - " \
- "use gnulib module flock for portability"), \
- flock ((fd), (op)))
+# if HAVE_RAW_DECL_FLOCK
+_GL_WARN_ON_USE (flock, "flock is unportable - "
+ "use gnulib module flock for portability");
+# endif