# Find doxygen.
find_package(Doxygen)

# Generate build targets and the doc/index.html file.
IF (DOXYGEN_FOUND OR LUA_PROGRAM_FOUND)
  add_custom_target(doc)

ELSE (DOXYGEN_FOUND OR LUA_PROGRAM_FOUND)
  message("Cannot locate Doxygen or lua, 'doc' target is not available")

ENDIF (DOXYGEN_FOUND OR LUA_PROGRAM_FOUND)