**Summary** Untested code will not remain in the repo **Use cases** Users will not think there is a supported built in viewer in GROMACS **Impact** Simpler code. Refactoring will not have to consider how to make this code compile and/or work. **Detailed description** Remove code in `src/programs/view` and cmake for X11 support and `-DGMX_X11` and any docs or env vars.