Linux Mint (Debian Edition)

This is a semi-rolling release distribution, and as such there won’t be any releases.
Since LMDE uses debian format for packages, apt-cacher-ng should work. Please refer to Debian section for more details. here

Gentoo

This mirror is configured to provide rsync access for the Gentoo portage system (used when doing emerge sync). To use mirror for emerge sync and for downloading the associated distfiles add the following two lines to /etc/make.conf (most useful if done before running emerge sync and bootstrap.sh during installation):

SYNC="rsync://repo.iitd.ac.in/gentoo-portage"
GENTOO_MIRRORS="http://repo.iitd.ac.in/gentoo"