From 4c16038e72b378e5864f12fad607abc071d94c6f Mon Sep 17 00:00:00 2001
From: Tony Kelman <tony@kelman.net>
Date: Fri, 1 Apr 2016 21:42:23 -0700
Subject: [PATCH] Fix build on Cygwin

use -std=gnu++11 instead of c++0x on cygwin to avoid
error: realpath was not declared in this scope

ref http://www.cygwin.com/ml/cygwin/2016-03/msg00005.html
---
 CMakeLists.txt | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d2edf829b..542bce3b4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -80,8 +80,15 @@ if(APPLE)
   set(CMAKE_CXX_FLAGS
     "${CMAKE_CXX_FLAGS} -std=c++11 -stdlib=libc++ -Wall -pedantic -Werror -Wextra")
 elseif(CMAKE_COMPILER_IS_GNUCXX)
+  if(CYGWIN)
+    set(CMAKE_CXX_FLAGS
+      "${CMAKE_CXX_FLAGS} -std=gnu++11")
+  else(CYGWIN)
+    set(CMAKE_CXX_FLAGS
+      "${CMAKE_CXX_FLAGS} -std=c++0x")
+  endif(CYGWIN)
   set(CMAKE_CXX_FLAGS
-    "${CMAKE_CXX_FLAGS} -std=c++0x -Wall -pedantic -Werror -Wextra -Werror=shadow")
+    "${CMAKE_CXX_FLAGS} -Wall -pedantic -Werror -Wextra -Werror=shadow")
   if (GCC_VERSION VERSION_GREATER 4.4)
     set(CMAKE_CXX_FLAGS
       "${CMAKE_CXX_FLAGS} -Wunused-result -Werror=unused-result")