{ lib, stdenv, fetchurl, tcl, tk }:

stdenv.mkDerivation rec {
  pname = "tkcvs";
  version = "8.2.1";

  src = fetchurl {
    url = "mirror://sourceforge/tkcvs/tkcvs_${lib.replaceStrings ["."] ["_"] version}.tar.gz";
    sha256 = "0kvj6rcx1153wq0n1lmd8imbrki6xy5wxghwzlb9i15l65sclg3i";
  };

  buildInputs = [ tcl tk ];

  patchPhase = ''
    sed -e 's@exec wish@exec ${tk}/bin/wish@' -i tkcvs/tkcvs.tcl tkdiff/tkdiff
  '';

  installPhase = ''
    ./doinstall.tcl $out
  '';

  meta = {
    homepage = "https://tkcvs.sourceforge.io";
    description = "TCL/TK GUI for cvs and subversion";
    license = lib.licenses.gpl2Plus;
    platforms = lib.platforms.unix;
  };
}