[NTG-context] How can I make a Gentoo Linux package for ConTeXt LMTX?

TexLive has texmfcnf.lua that doesn't really work with texlive-context installed by linux distributions. Arch Linux has its own patched version of texmfcnf.lua. It seems I'd be better off with a linux package for ConTeXt LMTX. How can I build and install ConTeXt LMTX on Gentoo Linux or any linux distribution? I wish it was as simple as ./configure, make, and make install.