#ifndef _GL_CTYPE_H
#define _GL_CTYPE_H
-/* The definition of GL_LINK_WARNING is copied here. */
+/* The definition of _GL_WARN_ON_USE is copied here. */
/* Return non-zero if c is a blank, i.e. a space or tab character. */
#if @GNULIB_ISBLANK@
# endif
#elif defined GNULIB_POSIXCHECK
# undef isblank
-# define isblank(c) \
- (GL_LINK_WARNING ("isblank is unportable - " \
- "use gnulib module isblank for portability"), \
- isblank (c))
+# if HAVE_RAW_DECL_ISBLANK
+_GL_WARN_ON_USE (isblank, "isblank is unportable - "
+ "use gnulib module isblank for portability");
+# endif
#endif
#endif /* _GL_CTYPE_H */