In MonoDevelop, how do I specify the target directory to be used when generating a package?

If I right click on the "Tarball" project, and go to Options > Files, I see some like this:

There are a couple of problems here:

• "pkg-config folder" uses /usr/local/lib/pkgconfig, instead of /usr/lib/pkgconfig. MonoDevelop itself doesn't look in /usr/local/lib/pkgconfig开发者_运维问答 for .pc files.
• This is a library, so I don't think I want it installed in "Program Files" (which uses /usr/local/lib/projectname. I think it should go in the GAC instead.

In this dialog, the fields are not editable. How can I change the target directory for these files?

I am running MonoDevelop 2.2 on Ubuntu Lucid.