cvsweb.cgi from devel/cvsweb 2.0.6 is broken with perl5.8 due to the latter's stricter taint checks. Probably the port should be updated to one of the newer releases coming out of projects/cvsweb.
Responsible Changed From-To: freebsd-ports-bugs->freebsd-cvsweb Over to maintainer(s).
State Changed From-To: open->closed Temporary fix applied. A real fix will come soon with the next update to 3.0.0. Thanks!