cmake find_package(Log4cplus) examples

AcademySoftwareFoundation/openvdb cmake/FindLog4cplus.cmake :13 

find_package(Log4cplus
  [version] [EXACT]      # Minimum or EXACT version
  [REQUIRED]             # Fail with error if Log4cplus is not found
  )

AcademySoftwareFoundation/openvdb cmake/FindOpenVDB.cmake :624 

find_package(Log4cplus REQUIRED)

AcademySoftwareFoundation/openvdb openvdb/openvdb/CMakeLists.txt :150 

find_package(Log4cplus ${MINIMUM_LOG4CPLUS_VERSION} REQUIRED)