cmake HAVE_OPENSSAG_CAMERA examples

OpenPHDGuiding/phd2 thirdparty/thirdparty.cmake :1009 

add_definitions(-DHAVE_OPENSSAG_CAMERA=1)

OpenPHDGuiding/phd2 thirdparty/thirdparty.cmake :1196 

add_definitions(-DHAVE_OPENSSAG_CAMERA=1)