--- external/tinygettext/CMakeLists.txt.orig	Tue Apr 18 17:37:50 2017
+++ external/tinygettext/CMakeLists.txt	Tue Apr 18 17:38:13 2017
@@ -131,7 +131,6 @@ option(WERROR "Stops on first compiler warning in debu
 option(WARNINGS "Enable long list of warnings for compiler to check" ON)
 
 CHECK_CXX_FLAG(std=c++0x)
-CHECK_CXX_FLAG(O3)
 IF(NOT MSVC)
     #MSVC is excessivly verbose when Wall is activated
     CHECK_CXX_FLAG(Wall)
