Then modify /etc/apt/sources.list to contain the URL of arm64 package
repository. This is the sources.list that I use:
- deb [arch=amd64] http://cz.archive.ubuntu.com/ubuntu xenial main universe
+ deb [arch=amd64] http://cz.archive.ubuntu.com/ubuntu xenial main universe multiverse restricted
deb-src http://cz.archive.ubuntu.com/ubuntu/ xenial main universe
- deb [arch=arm64] http://ports.ubuntu.com/ xenial main universe
+ deb [arch=arm64] http://ports.ubuntu.com/ xenial main universe multiverse restricted
Furthermore, Xenial has too old packages to cross build LLVM. For that
reason, we backport the following packages: `cmake_3.7.2-1` from