I had a similar problem, it looks like building spidermonkey requires huge amount of RAM, and if you don't have enough of it some build process crash. If you are building with -jX (with X which works fine for 0ad and the other libraries), you may want to decrease X when running build-source-libs.sh , so there are less simultaneously build processes and maximum RAM usage decrease.

Could you attach mainlog.html (from the logs folder) with such artifact?

The build failure occured when running /libraries/build-source-libs.sh  It is at the checking stage. I am using the latest code from gitea main branch as of 6th September 13:40 UTC ```  0:03.59 checking for rustc... /usr/bin/rustc 0:03.59 checking for cargo... /usr/bin/cargo 0:03.63 checking rustc version... 1.98.1 0:03.65 checking cargo version... 1.98.1 0:03.67 checking for rust host triplet... 0:03.67 ERROR: Don't know how to translate x86_64-pc-linux-gnu for rustc *** Fix above errors and then restart with "./mach build" ERROR: SpiderMonkey build failed ``` Host OS: Arch Linux   I found some similar discussions about spidermonkey packages on the Gentoo forum https://bugs.gentoo.org/915651 hopefully it can be of help

So, the game does it, I don't have to?

Thanks again! This one is a nice source.  It's always gameplay vs historical accuracy/realism vs visuals. People will be frustrated if they can't upgrade because they build their theater too close to another building. From what I learned, all hellenic theaters in the game are somehow not a good historical representation? So maybe now is the point to reconsider the footprint. I'd vote to go for a much larger one, as on ancient city plans the theaters are often one of the buildings taking the most space.