Building Open Source Software on DEC ULTRIX

This document provides practical advice and technical guidelines for compiling and building open source software on the obsolete but functional DEC ULTRIX V4.5 operating system. It covers essential topics including initial system configuration (such as installing software subsets and managing Y2K patches), common pitfalls when compiling console applications and daemons, and specific instructions for the MIT X Window System. Additionally, it details replacing older ULTRIX components with GNU replacements, manages system limitations, and includes a list of resources and contacts for further support.