Created attachment 208922 [details]
update beamer to 3.57
Our latex-beamer package is lagging behind (nearly three years), and the old upstream at bitbucket vanished recently.
Attached updates latex-beamer to 3.57 and has the package point to the new upstream location at github. Unfortunately, our tex packages are too old, we cannot use the l3build script - so we have to install everything by hand.
Package passes poudriere, and beamer still processes my slides (which are rather simple, but that's about all I have).