Sample configuration files for LaTeX2e color and graphics
Note that these files are, as far as possible, in the public domain and may be edited to suit the distribution being used.
Specifically they are released under the CC0 1.0 Universal licence https://creativecommons.org/publicdomain/zero/1.0/
They may be edited by end users, but more commonly should be edited by maintainers of TeX distributions to detect a suitable range of package options for the tex systems and dvi drivers available.
These color and graphics configurations will make the color and graphics packages default option be luatex, pdftex, vtex, xetex or dvips. Note that pdftex option is used for luatex versions older than luatex 0.87.
These files are currently maintained by the LaTeX3 project but incorporating work by Thomas Esser, Heiko Oberdiek, Sebastian Rahtz, Karl Berry and others.
Issues and change suggestions may be raised at github: