nix/pkgs: init sheepshaver

nix/pkgs/default.nix

@@ -12,4 +12,5 @@ args: {
   hg-git = import ./hg-git.nix args;
   erbium = import ./erbium args;
   python-emv = import ./python-emv.nix args;
+  sheepshaver = import ./sheepshaver.nix args;
 } // (import ./heptapod-runner.nix args)

nix/pkgs/sheepshaver.nix

@@ -0,0 +1,38 @@
+# SPDX-FileCopyrightText: 2020 Luke Granger-Brown <depot@lukegb.com>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+{ pkgs, ... }:
+pkgs.stdenv.mkDerivation rec {
+  pname = "sheepshaver";
+  version = "29bb3d5a5a99db494049f64c678f38301ef63432";
+
+  src = pkgs.fetchFromGitHub {
+    owner = "cebix";
+    repo = "macemu";
+    rev = version;
+    sha256 = "sha256:1rqyyyhm7w73wg29l5l1xwqljzkhd6s7smdhq3zncrkkx2rxc7fc";
+  };
+  unpackPhase = ''
+    cp -R $src/ writable/
+    chmod -R u+w writable/
+    make -C writable/SheepShaver links
+  '';
+  sourceRoot = "writable/SheepShaver/src/Unix";
+
+  nativeBuildInputs = with pkgs; [
+    autoconf automake file perl pkgconfig
+  ];
+
+  buildInputs = with pkgs; [
+    gtk2 SDL xorg.libX11 xorg.libSM libslirp
+  ];
+
+  configureFlags = [
+    "--enable-sdl-audio"
+  ];
+
+  preConfigure = ''
+    NO_CONFIGURE=1 ./autogen.sh
+  '';
+}