In reply to@opna2608:matrix.org builtins.currentSystem from pkgsi686Linux.lix gives x86-linux which is nonesense, so I guess the fixups are completely unused, but supposed to be used. submitted separately since this affects more platforms than just POWER: https://gerrit.lix.systems/c/lix/+/3793
That has also been broken in cppnix and recently fixed. You’d also need to fix up MIPS/32 bit Arm.