CHECK_STRUCT_HAS_MEMBER("struct stat" st_mtim "sys/types.h;sys/stat.h" HAVE_STRUCT_STAT_ST_MTIM LANGUAGE C)CHECK_STRUCT_HAS_MEMBER("struct stat" st_mtimespec "sys/types.h;sys/stat.h" HAVE_STRUCT_STAT_ST_MTIMESPEC LANGUAGE C)CHECK_STRUCT_HAS_MEMBER("struct stat" st_mtime_nsec sys/stat.h HAVE_STRUCT_STAT_MTIME_NSEC LANGUAGE C)IF(HAVE_STRUCT_STAT_ST_MTIM)CHECK_STRUCT_HAS_MEMBER("struct stat" st_mtim.tv_nsec sys/stat.h HAVE_STRUCT_STAT_NSEC LANGUAGE C)ELSEIF(HAVE_STRUCT_STAT_ST_MTIMESPEC)CHECK_STRUCT_HAS_MEMBER("struct stat" st_mtimespec.tv_nsec sys/stat.h HAVE_STRUCT_STAT_NSEC LANGUAGE C)ELSE()SET( HAVE_STRUCT_STAT_NSEC ON )ENDIF()IF(HAVE_STRUCT_STAT_NSEC OR WIN32)OPTION( USE_NSEC "Care about sub-second file mtimes and ctimes" ON )ENDIF()