{ stdenv, fetchurl }: let versionNumber = "3.8"; in stdenv.mkDerivation { name = "gnugo-${versionNumber}"; src = fetchurl { url = "mirror://gnu/gnugo/gnugo-${versionNumber}.tar.gz"; sha256 = "0wkahvqpzq6lzl5r49a4sd4p52frdmphnqsfdv7gdp24bykdfs6s"; }; meta = { description = "GNU Go - A computer go player"; homepage = "http://http://www.gnu.org/software/gnugo/"; license = stdenv.lib.licenses.gpl3; }; }