--- ray/CMakeLists.txt	2012/08/16 17:59:45	1.7
+++ ray/CMakeLists.txt	2014/03/20 22:49:21	1.9
@@ -5,6 +5,7 @@ enable_testing()
 include(CTest)
 
 option(BUILD_SHARED_LIBS "Build radiance using shared libraries?" OFF)
+option(BUILD_HEADLESS "Build radiance without any GUI components?" OFF)
 
 if(NOT WIN32)
   set(CPACK_INCLUDE_TOPLEVEL_DIRECTORY 1)
@@ -34,6 +35,7 @@ endif()
 if(APPLE)
   add_definitions(-DBSD -DNOSTEREO -Dfreebsd)
   include_directories(/usr/X11R6/include)
+  SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mmacosx-version-min=10.6")
 endif()
 
 IF( BUILD_PACKAGE )
@@ -51,8 +53,10 @@ SET(CPACK_RESOURCE_FILE_LICENSE "${radiance_SOURCE_DIR
 
 include(CPack)
 
-find_package(Qt4 COMPONENTS QtCore QtGui)
-find_package(X11)
+if(NOT BUILD_HEADLESS)
+  find_package(Qt4 COMPONENTS QtCore QtGui)
+  find_package(X11)
+endif()
 
 SET(EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR}/bin)