nix: update to upstream nixpkgs

src/default.nix

@@ -1,14 +1,16 @@
-with import <nixpkgs> {};
 let
-  gputils = callPackage ./gputils.nix {};
-  sdcc = pkgs.callPackage ./sdcc.nix {
-    inherit gputils;
-    disabled = lib.splitString " " "mcs51 z80 z180 r2k r3ka gbz80 tlcs90 ds390 ds400 pic16 hc08 s08 stm8";
-  };
+  pkgs = import <nixpkgs> {};
+  sdcc_ = (pkgs.sdcc.override {
+    inherit (pkgs) gputils;
+    excludePorts = ["mcs51" "z80" "z180" "r2k" "r3ka" "gbz80" "tlcs90" "ds390" "ds400" "pic16" "hc08" "s08" "stm8"];
+  }).overrideAttrs (o: {
+    enableParallelBuilding = true;
+  });
 in
+with pkgs;
 stdenv.mkDerivation {
   name = "blink";
-  buildInputs = [ sdcc gputils ];
+  buildInputs = [ sdcc_ gputils ];
   src = ./.;
   installPhase = ''
     mkdir $out

src/gputils.nix

@@ -1,16 +0,0 @@
-{ stdenv, fetchurl }:
-
-stdenv.mkDerivation rec {
-  version = "1.5.0-1";
-  name = "gputils-${version}";
-  src = fetchurl {
-    url = "mirror://sourceforge/gputils/${name}.tar.bz2";
-    sha256 = "055v83fdgqljprapf7rmh8x66mr13fj0qypj49xba5spx0ca123g";
-  };
-  meta = with stdenv.lib; {
-    homepage = http://sdcc.sourceforge.net/;
-    license = licenses.gpl2;
-    platforms = platforms.linux;
-    maintainers = [ maintainers.yorickvp ];
-  };
-}

src/sdcc.nix

@@ -1,37 +0,0 @@
-{ stdenv, fetchurl, bison, flex, boost, texinfo, autoconf, zlib, gputils ? null, disabled ? [] }:
-let
-  allDisabled = (if gputils == null then [ "pic14" "pic16" ] else []) ++ disabled;
-  # choices: mcs51 z80 z180 r2k r3ka gbz80 tlcs90 ds390 ds400 pic14 pic16 hc08 s08 stm8
-  inherit (stdenv) lib;
-in
-stdenv.mkDerivation rec {
-  version = "3.8.0";
-  name = "sdcc-${version}";
-
-  src = fetchurl {
-    url = "mirror://sourceforge/sdcc/sdcc-src-${version}.tar.bz2";
-    sha256 = "08dvvdxd99hb50wvs8m986v3scfj1rdjw18js7pk5n3vxf6nccdk";
-  };
-
-  buildInputs = [ bison flex boost texinfo gputils autoconf zlib ];
-
-  configureFlags = ''
-    ${lib.concatMapStringsSep " " (f: "--disable-${f}-port") allDisabled}
-  '';
-
-  meta = with lib; {
-    description = "Small Device C Compiler";
-    longDescription = ''
-      SDCC is a retargettable, optimizing ANSI - C compiler suite that targets
-      the Intel MCS51 based microprocessors (8031, 8032, 8051, 8052, etc.), Maxim
-      (formerly Dallas) DS80C390 variants, Freescale (formerly Motorola) HC08 based
-      (hc08, s08) and Zilog Z80 based MCUs (z80, z180, gbz80, Rabbit 2000/3000,
-      Rabbit 3000A). Work is in progress on supporting the Microchip PIC16 and
-      PIC18 targets. It can be retargeted for other microprocessors.
-    '';
-    homepage = http://sdcc.sourceforge.net/;
-    license = licenses.gpl2;
-    platforms = platforms.linux;
-    maintainers = [ maintainers.bjornfor maintainers.yorickvp ];
-  };
-}