This SlackBuild script can be used to build older versions of gzdoom. Supported versions: 1.8.09 - last version to use SDL1 (good for older/slower systems). 1.9.1 - last version to not require OpenGL 3.0 (good for nouveau). 2.4.0 - latest version of gzdoom 2.x. By default, 2.4.0 is built (as per the .info file). If you'd like to try one of the others, download the source, save it in the SlackBuild directory, and run gzdoom.SlackBuild with VERSION=1.8.09 or VERSION=1.9.1 set in the environment. If you use sbopkg, you can create a custom .info file, and copy the lines below: For 1.8.09: VERSION="1.8.09" DOWNLOAD="https://slackware.uk/~urchlay/src/g1.8.09.tar.gz" MD5SUM="ddc1dd8aef254312031184be6dec21e6" For 1.9.1: VERSION="1.9.1" DOWNLOAD="https://github.com/coelckers/gzdoom/archive/g1.9.1.tar.gz" MD5SUM="0fb38fcf73084f9a798f9d3af643d02e"