This is GNU GCC 2.8.1, compiled to support C, C++, and Objective-C. It is supplied as an alternate compiler for Slackware. For various reasons I think the overall quality is superior with Cygnus' egcs compiler, though. One problem with gcc-2.8.x is that you can't compile 2.0.x kernels with it. If you try, you'll run into a problem starting X (among other things). To make this your default compiler, just install it with 'installpkg'. If you decide later to switch back to egcs, just remove this package with 'removepkg' and then reinstall egcs with 'installpkg'.