I had a similar error yesterday when trying to build Otter-Browser. It too said “Fetching package for lib:libgl_x86 >= 1.0.0 … Nothing to do.” (not sure about the exact version anymore).
Luckily mmlr was around on IRC and it turned out that I had an old mesa_x86 package in my system. This tripped up pkgman in some way, that mmlr is now aware of and can hopefully fix eventually.
The solution for me was to do a “pkgman full-sync”, which I haven’t done after switching to the new “eu” repo. I decided to let it uninstall anything that would conflict. After a reboot I tried again and it all worked.
Thanks mmlr!