+#if @GNULIB_FLOORF@
+# if !@HAVE_DECL_FLOORF@
+# define floorf rpl_floorf
+extern float floorf (float x);
+# endif
+#elif defined GNULIB_POSIXCHECK
+# undef floorf
+# define floorf(x) \
+ (GL_LINK_WARNING ("floorf is unportable - " \
+ "use gnulib module floorf for portability"), \
+ floorf (x))