I successfully built and installed GCC 4.0.3 on Slackware 10.2.
Bootstrapping info: 1. Output of srcdir/config.guess: i686-pc-linux-gnu 2. Output of "gcc -v": Using built-in specs. Target: i686-pc-linux-gnu Configured with: ../gcc-src/gcc-4.0.3/configure Thread model: posix gcc version 4.0.3 3. Distribution info for GNU/Linux: Distribution: Slackware 10.2 Linux kernel: 2.6.16 glibc version: 1.x: libglib-1.2.so.0.0.10 2.x: libglib-2.0.so.0.800.4 4. Info for people building GCC on the same configuration: If you install to the default directory, which is /usr/local, you either have to delete, rename or redirect the programs in /usr/bin to /usr/local/bin. Also, you might want to link /usr/include/c++/4.0.3 to /usr/local/include/c++/4.0.3. 5. Completeness of target-specific installation notes: The document is sufficient.