squid and SQUID_FOLLOW_XFF

[Miguel]

Hi, i just installed squid using ports in 6.1-RC1, i noticed that i 
forgot to enable the SQUID_FOLLOW_XFF flag where configuring the 
options, i want to add it now, how can i do that?
btw, im using portinstall, and i have tried

portinstall -m '-DSQUID_FOLLOW_XFF' squid

 without luck,  it didnt work out.
 when i add the lines

acl miguel src 192.168.10.124
follow_x_forwarded_for deny miguel

i got this error message:

proxy# /usr/local/etc/rc.d/squid restart
2006/04/27 13:51:52| parseConfigFile: line 1894 unrecognized: 'follow_x_forwarded_for deny miguel'
Waiting for PIDS: 432 434.
Starting squid.
2006/04/27 13:51:54| parseConfigFile: line 1894 unrecognized: 'follow_x_forwarded_for deny miguel'

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Miguel