--- a/src/qtchooser/Makefile	2018-01-19 08:48:01.930989200 +0100
+++ b/src/qtchooser/Makefile	2018-01-19 08:50:07.888154500 +0100
@@ -8,6 +8,8 @@
 CHK_DIR_EXISTS= test -d
 MKDIR         = mkdir -p
 
+CXXFLAGS     := $(CXXFLAGS) -D_GNU_SOURCE
+
 ####### Files
 
 SOURCES       = main.cpp