Index: b/qt4/Makefile.am
===================================================================
--- b/qt4/Makefile.am
+++ b/qt4/Makefile.am
@@ -35,6 +35,7 @@
 
 
 AM_CPPFLAGS = $(COMMON_CFLAGS) \
+	-std=gnu++11 \
 	-I$(top_srcdir) -I$(top_srcdir)/secmem \
 	$(ncurses_include) -I$(top_srcdir)/pinentry
 AM_CXXFLAGS = $(QT4_CORE_CFLAGS) $(QT4_GUI_CFLAGS)