{ callPackage, fetchurl, ... } @ args: callPackage ./generic.nix (args // rec { release = "8.6"; version = "${release}.11"; src = fetchurl { url = "mirror://sourceforge/tcl/tcl${version}-src.tar.gz"; sha256 = "0n4211j80mxr6ql0xx52rig8r885rcbminfpjdb2qrw6hmk8c14c"; }; })