From e2d51eb4e5d435460bdb40628a18d010a8b2efe9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20Gl=C3=A4=C3=9Fle?= <t_glaessle@gmx.de>
Date: Wed, 1 Aug 2018 03:33:30 +0200
Subject: [PATCH] Fix c++11 compilation on cmake < 3.1

The compiler-agnostic CXX_STANDARD feature was added in cmake 3.1.
---
 src/CMakeLists.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 694a3cef6..886e38384 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -57,8 +57,12 @@ set_target_properties(madx PROPERTIES LINKER_LANGUAGE Fortran)
 
 # set library version:
 set_target_properties(madx     PROPERTIES VERSION ${MADX_VERSION})
-set_target_properties(madx     PROPERTIES CXX_STANDARD 11)
 
+if (${CMAKE_VERSION} VERSION_LESS "3.1")
+  set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+else()
+  set_target_properties(madx   PROPERTIES CXX_STANDARD 11)
+endif()
 
 # adding an executable:
 if(MADX_BUNDLE)