odd pkglint warning / mod_ucam_webauth

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

# pkglint
WARN: Makefile:16: "apache24" is not valid for PKG_APACHE_ACCEPTED. Use one of 
{ apache13 apache2 apache22 } instead.
0 errors and 2 warnings found. (Use -e for more details.)
# make show-var VARNAME=PKG_APACHE_ACCEPTED
apache2 apache22 apache24

?

I got the above having just packaged mod_ucam_webauth as ap2-auth-ucam
  http://raven.cam.ac.uk/project/apache/

Is this something for pkgsrc or rather too Cambridge specific?

Cheers,

Patrick