appimage build failures

[Jack]

It looks like our appimage builds (both release and master) have been  
failing for about two weeks.  Just a few checks of the release failures  
look like failures of dependencies, mentioning glibc 27 and 29.  On  
Gentoo, everything prior to glibc 2.37 has been masked as no longer  
supported.  I have no idea if the problem is in what's available to  
Jenkins, or what some packages are requesting.  Should I open a  
sysadmin ticket, or a bug against craft, or has this already been done?

Jack