The mapping. format is as follows: / e.g. for Gentoo: vim-core/vim This will map Gentoo's vim-core to SMGL's vim. This is done by convert2smgl.sh calling the following: for i in do =${/$i} done e.g. for Gentoo for i in mapping.gentoo do GENTOO_PACKAGES=${GENTOO_PACKAGES/$i} done If we don't have the package, then do the following: / e.g. for Gentoo's sysvinit package sysvinit/ This will remove sysvinit from the list