Hi, While reviewing the RFS #1108879, I noted `debian/justbuild.makefile` using `uname` and it is used to build `justbuild` for Debian. Based on prior experience that implies that `justbuild` will not cross-compile correctly. Anything place using `uname` would normally have to use a `dpkg-architecture` value. Mostly commonly one of the `DEB_HOST_` ones. In rare cases, the `DEB_BUILD_` one and in exceptionally rare cases the `DEB_TARGET_` ones. I did not track down this case. If you need assistance, debian-cross@lists.debian.org might be useful. Best regards, Niels