From e3524cefaa9bc6ebe1b9f0d31ad627dbb8bfb9d8 Mon Sep 17 00:00:00 2001
From: Kornel Benko <kornel@lyx.org>
Date: Thu, 14 May 2015 21:21:07 +0200
Subject: [PATCH] Cmake build: Abort build-configuration if using a too old c++
 gnu compiler

---
 CMakeLists.txt | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 785e37e7d4..531532627d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -68,8 +68,15 @@ if(LYX_XMINGW)
 endif()
 
 if(NOT help AND NOT HELP)
-	# 'project' triggers the searching for a compiler
-	project(${LYX_PROJECT})
+  # 'project' triggers the searching for a compiler
+  project(${LYX_PROJECT})
+  if (CMAKE_COMPILER_IS_GNUCXX)
+    if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "4.0")
+      message(STATUS "Gnu CXX compiler version = ${CMAKE_CXX_COMPILER_VERSION}")
+      message(STATUS "is too old, should be >= 4.0")
+      message(FATAL_ERROR "Exiting")
+    endif()
+  endif()
 endif()
 
 if(UNIX)