+#if @GNULIB_TRUNCL@
+# if !@HAVE_DECL_TRUNCL@
+# define truncl rpl_truncl
+extern long double truncl (long double x);
+# endif
+#elif defined GNULIB_POSIXCHECK
+# undef truncl
+# define truncl(x) \
+ (GL_LINK_WARNING ("truncl is unportable - " \
+ "use gnulib module truncl for portability"), \
+ truncl (x))
+#endif
+