I made some progress on my distro!
Here is everything I can do:

* build packs statically against musl (including pcc and binutils)
* sync packs from a remote repo into a local directory
* install packs in a chroot
* compile a "hello world!" with pcc from within the chroot

Here is a proof: http://raw.z3bra.org/dev/random/distro.webm

For the upcoming steps:

* fix bugs in the pack manager
* boot AGAIN an LXC container / on real hardware
* build packs from within the distro
* enjoy!