Kreato Linux, and its package manager kpkg supports cross-compilation.

Cross-compilation allows you to build packages for another architecture/system without the use of emulation.

Gathering a cross-compiler

Cross-compilation requires a cross-compilation toolchain to build packages with. Kreato Linux currently has aarch64-linux-gnu cross-compiler toolchain available on the repositories at moment, additions are welcome.

You can install the binary first, then build later, or just install the binary and use that. Kreato Linux also provides the builder-aarch64-cross-gnu container that has a toolchain setup by default. Please note that cross-compilation without having a binary first will not be possible, as building glibc and libxcrypt requires a cross-compiler to be present, creating a circular dependency.

Cross-compiling Kreato Linux packages

Now that you have a cross-compiler toolchain, you can build packages by running kpkg build packageName --target=target. Replace target with the desired target, such as aarch64-linux-gnu. If the package is supported, it should build (and install if --dontInstall is not used) the package with the specified target.