Using the PHYlogeny Inference Package on Gentoo systems Location of the factor program On Gentoo systems, the PHYLIP program "factor" is named "factor-phylip", in order to avoid a file collision with the program of the same name provided by the "sys-apps/coreutils" package. Location of the font files PHYLIP programs will find font files only if they are in a directory referenced by the "PATH" variable or if they are in the current working directory. When working with PHYLIP programs that need these files, either copy or symlink the fonts you need to your working directory, or add "/usr/share/phylip/fonts/" to your "PATH" variable.