I have upgraded flex (src/usr.bin/lex) from version 2.5.2 to 2.5.4.
2.5.3 and 2.5.4 were bug-fix releases, so you should not see any
incompatibility.

If you have any problems with flex, let me know.
-- 
Mike Long <mike.long@analog.com>     <URL:http://www.shore.net/~mikel>
VLSI Design Engineer         finger mikel@shore.net for PGP public key
Analog Devices, CPD Division          CCBF225E7D3F7ECB2C8F7ABB15D9BE7B
Norwood, MA 02062 USA       (eq (opinion 'ADI) (opinion 'mike)) -> nil