portsdb -Uu and new mirror

[Brian Astill]

My ISP now stores "all" the FBSD ports and sources

#portsdb -Uu
Updating the ports index ...make: don't know how to make 
//ftp.filearena.net/pub/FreeBSD/ports/distfiles//(continuing): 
malformed entry: make: don't know how to make 
//ftp.filearena.net/pub/FreeBSD/ports/distfiles//(continuing)
make: don't know how to make 
//ftp.filearena.net/pub/FreeBSD/ports/distfiles//(continuing): 
malformed entry: make: don't know how to make 
//ftp.filearena.net/pub/FreeBSD/ports/distfiles//(continuing)

and so on ad infinitum (well nearly :-) )  until:

failed to generate INDEX!
/usr/local/lib/ruby/site_ruby/1.6/portsdb.rb:210:in `update': index 
generation error (PortsDB::IndexFileError)
        from /usr/local/sbin/portsdb:154:in `main'
        from /usr/local/sbin/portsdb:66:in `initialize'
        from /usr/local/sbin/portsdb:66:in `new'
        from /usr/local/sbin/portsdb:66:in `main'
        from /usr/local/sbin/portsdb:205

OK, so I have rebuilt the ports index files by commenting out the 
offending references to filearena in /etc/make.conf BUT I need to 
uncomment them again to take advantage of my ISP's collection of 
distfiles.

Is there a workaround that will save me commenting/uncommenting all the 
time?

-- 
Regards,
Brian