pkg_add on Linux doesn't look up pkg_summary.bz2/gz?

[Mayuresh <mayuresh%acm.org@localhost>]

I have an http URL where I keep some pkgsrc packages built for Linux,
along with pkg_summary.gz and pkg_summary.bz2.

I set PKG_PATH to above URL.

I have tested that the pkg_summary files are downloading fine from this
URL.

But when I say "pkg_add  <mypkg>" it says <mypkg>* not found.

A full filename might possibly work, but I'd like the package name to work
as well, so that users aren't required to deal with the version number,
filename formation etc.

I tried strace on pkg_add, but it does not show _summary in the trace.

Am I missing something here?

-- 
Mayuresh