--- ray/src/CMakeLists.txt	2016/02/03 22:54:01	1.5
+++ ray/src/CMakeLists.txt	2016/03/22 21:36:24	1.6
@@ -29,8 +29,9 @@ add_subdirectory(ot)
 add_subdirectory(px)
 add_subdirectory(rt)
 add_subdirectory(util)
-# only use qtrvu if qt5 is found
-if(Qt5Widgets_DIR)
-  add_subdirectory(qtrvu)
+if(NOT BUILD_HEADLESS)
+  # only use qtrvu if qt5 is found
+  if(Qt5Widgets_DIR)
+    add_subdirectory(qtrvu)
+  endif()
 endif()
-