+ /* Find the index of the least-significant set bit. */
+#if @GNULIB_FFS@
+# if !@HAVE_FFS@
+_GL_FUNCDECL_SYS (ffs, int, (int i));
+# endif
+_GL_CXXALIAS_SYS (ffs, int, (int i));
+_GL_CXXALIASWARN (ffs);
+#elif defined GNULIB_POSIXCHECK
+# undef ffs
+# if HAVE_RAW_DECL_FFS
+_GL_WARN_ON_USE (ffs, "ffs is not portable - use the ffs module");
+# endif
+#endif
+