$ perle 'use Fcntl qw{O_RDONLY F_NOCACHE}; say O_RDONLY; say F_NOCACHE'
"F_NOCACHE" is not exported by the Fcntl module
Can't continue after import errors at -e line 1.
        main::BEGIN() called at -e line 1
        eval {...} called at -e line 1
BEGIN failed--compilation aborted at -e line 1.