find_program(JAVACC_EXECUTABLE NAMES javacc javaCC Javacc JavaCC javacc.bat DOC "path to the javacc executable")
mark_as_advanced(JAVACC_EXECUTABLE)
if(JAVACC_EXECUTABLE)
  set(JAVACC_FOUND 1)
  message(STATUS "The javacc executable: ${JAVACC_EXECUTABLE}")
else()
  set(JAVACC_FOUND 0)
  message(STATUS "The javacc executable not found, using existing files")
endif()