$ nm /opt/myperl/lib/5.8.9/i686-linux/auto/Fcntl/Fcntl.so | grep PL_curpad
         U PL_curpad
$ nm /opt/myperl/bin/perl | grep PL_curpad
0813c000 B PL_curpad
$ /opt/myperl/bin/perl -MFcntl -e 'print "ok\n";'
ok