commit 31d3ac3d691b2a1b07991e67302fd52b0f409cac
Author: Andy Li <andy@onthewings.net>
Date:   Thu Jul 13 13:23:33 2017 +0800

    include xlocale.h only if it is available since it is removed in recent glibc
    
    see: https://bugzilla.redhat.com/show_bug.cgi?id=1464244
    
    (Backported from e286c8f3301fa443255a3101d14b7392467051b8)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8de1702..d64cab9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,6 @@
 cmake_minimum_required(VERSION 2.8.7)
 
+include(CheckIncludeFile)
 project(neko C)
 
 set(CMAKE_OSX_ARCHITECTURES x86_64)
@@ -48,6 +49,8 @@ set(NEKO_VERSION_MAJOR 2)
 set(NEKO_VERSION_MINOR 1)
 set(NEKO_VERSION_PATCH 0)
 
+check_include_file(xlocale.h HAVE_XLOCALE_H)
+
 configure_file (
 	"${CMAKE_SOURCE_DIR}/vm/neko.h.in"
 	"${CMAKE_BINARY_DIR}/neko.h"
diff --git a/libs/std/sys.c b/libs/std/sys.c
index 8003d41..ae0cfee 100644
--- a/libs/std/sys.c
+++ b/libs/std/sys.c
@@ -41,7 +41,11 @@
 #	include <sys/time.h>
 #	include <sys/times.h>
 #	include <sys/wait.h>
+#ifdef HAVE_XLOCALE_H
 #	include <xlocale.h>
+#else
+#	include <locale.h>
+#endif
 #endif
 
 #ifdef NEKO_MAC
diff --git a/vm/neko.h.in b/vm/neko.h.in
index bb9ec1b..147ecce 100644
--- a/vm/neko.h.in
+++ b/vm/neko.h.in
@@ -88,6 +88,8 @@
 #	include <stdint.h>
 #endif
 
+#cmakedefine HAVE_XLOCALE_H
+
 #define NEKO_VERSION_MAJOR	@NEKO_VERSION_MAJOR@
 #define NEKO_VERSION_MINOR	@NEKO_VERSION_MINOR@
 #define NEKO_VERSION_PATCH	@NEKO_VERSION_PATCH@