Compiling Xen on Slackware

Hey guys, I am trying to compile Xen-3.0.3 on Slackware12. It's been only one week since started using Slackware, and I am loving it.
The problem I have is that during the make tools phase, the compilation requires crypto libraries, and I do not know how can I get them on Slack. On my Debian box, the package is libssl-dev (I am not very sure.) I have installed openssl and libgrypt packages, but they don't seem to help.
If somebody can point out which package will provide those libraries, I will be very greatful.

Thanks for reading this.:\)