How do I zip a directory of files using C++?

I have found the following two libraries:

• ZipIOS++. Seems to be "pure" C++. They don't list Windows explicitly as a supported platform. So i think you should try your luck yourself.
• QuaZIP. Based on Qt4. Actually looks nice. They list Windows explicitly (Using mingw). Apparently, it is a C++ wrapper for [this] library.

Ah, and of course, i have ripped those sites from this Qt Mailinglist question about Zipping/Unzipping of directories :)