+#if @GNULIB_DUPLOCALE@
+# if @REPLACE_DUPLOCALE@
+# if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+# undef duplocale
+# define duplocale rpl_duplocale
+# endif
+_GL_FUNCDECL_RPL (duplocale, locale_t, (locale_t locale) _GL_ARG_NONNULL ((1)));
+_GL_CXXALIAS_RPL (duplocale, locale_t, (locale_t locale));
+# else
+# if @HAVE_DUPLOCALE@
+_GL_CXXALIAS_SYS (duplocale, locale_t, (locale_t locale));
+# endif
+# endif
+# if @HAVE_DUPLOCALE@
+_GL_CXXALIASWARN (duplocale);
+# endif
+#elif defined GNULIB_POSIXCHECK
+# undef duplocale
+# if HAVE_RAW_DECL_DUPLOCALE
+_GL_WARN_ON_USE (duplocale, "duplocale is buggy on some glibc systems - "
+ "use gnulib module duplocale for portability");
+# endif
+#endif
+