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The toolChains should be accessed via the `model` block which is not available under Kotlin DSL. It's mounted as an extension on the project so it may work, we would have to try it.

As for the cross-compilation, the newer core plugins (Gradle) dont have full support to map `toolChains` target to `library` target machine. Using the Nokee plugins, the target machine is mapped to the toolChains target using as a concat of the name of the os family followed by architecture name. So Linux aarch64 would be `linuxaarch64`.

Do you have an example for using the nokee plugin with a custom toolchain? And does that mean my toolchain name would be `nxaarch64` or `horizonaarch64`?

Only the name passed to `target` need to be specific. The executable name can be anything.

There is no sample but the best example is M1 toolchain support: <https://github.com/nokeedev/gradle-native/issues/294#issuecomment-867978647|https://github.com/nokeedev/gradle-native/issues/294#issuecomment-867978647>

It should give you a good idea of how to do it.