diff --git a/src/libtomahawk/CMakeLists.txt b/src/libtomahawk/CMakeLists.txt
index 3d66288e8..1071ad8ac 100644
--- a/src/libtomahawk/CMakeLists.txt
+++ b/src/libtomahawk/CMakeLists.txt
@@ -159,7 +159,7 @@ if(QCA2_FOUND)
     set( libGuiHeaders ${libGuiHeaders} utils/GroovesharkParser.h )
 endif()
 
-if(UNIX AND NOT APPLE)
+if(UNIX AND NOT APPLE AND NOT Qt5Core_DIR)
     if(BUILD_GUI AND X11_FOUND)
         include_directories( ${THIRDPARTY_DIR}/libqnetwm )
         list(APPEND libSources ${libSources} ${THIRDPARTY_DIR}/libqnetwm/libqnetwm/netwm.cpp)