--- a/CMakeLists.txt	2017-03-15 00:31:04.000000000 +0100
+++ b/CMakeLists.txt	2019-07-21 16:39:14.365729343 +0200
@@ -14,6 +14,8 @@
   set(CMAKE_AUTOMOC ON)
   find_package(Qt5Core REQUIRED)
   find_package(Qt5Gui REQUIRED)
+  set (CMAKE_CXX_STANDARD 11)
+  set (CMAKE_CXX_EXTENSIONS OFF)
 else()
   find_package(Qt4 REQUIRED)
   # properly set up compile flags (QT_DEBUG/QT_NO_DEBUG, ...)