Doxygen expects YES instead of ON

Author: kees-jan

cmake/Doxygen.cmake

@@ -1,9 +1,9 @@
 function(enable_doxygen)
  option(ENABLE_DOXYGEN "Enable doxygen doc builds of source" OFF)
  if(ENABLE_DOXYGEN)
- set(DOXYGEN_CALLER_GRAPH ON)
- set(DOXYGEN_CALL_GRAPH ON)
- set(DOXYGEN_EXTRACT_ALL ON)
+ set(DOXYGEN_CALLER_GRAPH YES)
+ set(DOXYGEN_CALL_GRAPH YES)
+ set(DOXYGEN_EXTRACT_ALL YES)
  find_package(Doxygen REQUIRED dot)
  doxygen_add_docs(doxygen-docs ${PROJECT_SOURCE_DIR})