The only Gentoo for non-rooted phones without fakeroot. Also works on rooted Android phones.
It is in beta stage, so USE ONLY IF
(1) you understand that there will be bugs
(2) you are ready to report full bug reports (ideally, with the full shell session captured by bin/script or GooglePlay's "Terminal IDE", in text format)
(3) you have an experience of installing a package in Gentoo Linux.
It installs in directory /data/data/com.spartacusrex.spartacuside/gentoo_armv6l...