Most branches FTBFS on Jenkins since the 3.11 release

Originally created by @intrigeri on #16226 (Redmine)

It seems that the 3.11 release process was left in a state that breaks the build of most branches: the only branch that currently builds on Jenkins is the devel one. If you need help to get things back into working order, let me know :)

Related issues

Related to #16060 (closed)
Blocks #16110 (closed)

Edited May 15, 2020 by intrigeri

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information