--- ray/src/CMakeLists.txt	2011/10/28 20:46:47	1.2
+++ ray/src/CMakeLists.txt	2016/03/22 21:36:24	1.6
@@ -7,9 +7,6 @@ else()
   set(LIB_M )
 endif()
 
-find_package(OpenGL)
-find_package(X11)
-
 include_directories(common)
 # create a macro to generate
 macro(create_version_file version_file)
@@ -32,8 +29,9 @@ add_subdirectory(ot)
 add_subdirectory(px)
 add_subdirectory(rt)
 add_subdirectory(util)
-# only use rvu if qt4 is found
-if(QT4_FOUND)
-  add_subdirectory(qtrvu)
+if(NOT BUILD_HEADLESS)
+  # only use qtrvu if qt5 is found
+  if(Qt5Widgets_DIR)
+    add_subdirectory(qtrvu)
+  endif()
 endif()
-