My advice is to choose whether you want lwp/rpc2/rvm from OS packages,
or from CVS, and have only one or the other.

NetBSD pkgsrc uses 'buildlink' to constrain builds to only the
pkgsrc-specifieed libraries.  This is hairy, but does work on Linux
and other systems.  Unfortunately the coda package is lame/old/broken;
I hope to update it some day.