If you just want to remove all 32-bit software: removepkg /var/log/packages/32* removepkg /var/log/packages/linux32* If you want to make a pure64 distribution using /lib and /usr/lib: 1) Remove the c/ directory from slackware/, source/ 2) Remove the reference to the C series from isolinux/setpkg 3) Replace lib64 with lib in all the SlackBuild scripts, and delete blocks moving /usr/lib/pkgconfig to /usr/lib64/pkgconfig 4) Re-run all the SlackBuild scripts