diff --git a/libBoo.pri b/libBoo.pri
index f8f9b4b..94b75a5 100644
--- a/libBoo.pri
+++ b/libBoo.pri
@@ -1,3 +1,5 @@
+!contains(CONFIG,c++11):CONFIG += C++11
+
 HEADERS += \
     $$PWD/include/boo.hpp \
     $$PWD/include/IContext.hpp \
@@ -13,12 +15,6 @@ mac:HEADERS += \
 win32:HEADERS += \
     $$PWD/include/CWGLContext.hpp \
 
-
-SOURCES += \
-    $$PWD/src/CSurface.cpp \
-    $$PWD/src/CCGLContext.cpp \
-    $$PWD/src/CRetraceWaiter.cpp
-
 unix:SOURCES += \
     $$PWD/src/CGLXContext.cpp \