GCC 3.0.1: After upgrading to GCC 3 you have to reinstall the cxxlibs.tgz package from your Slackware CD-ROM. If you don't reinstall it, you cannot run C++ binaries compiled with the old GCC from your Slackware release. If you want to install GCC 3 together with an existing GCC 2.95, you can use the special addon packages in the 'addon' directory.