diff --git a/pkgs/gf-pgf/default.nix b/pkgs/gf-pgf/default.nix
index ff4c1fa..012ffca 100644
--- a/pkgs/gf-pgf/default.nix
+++ b/pkgs/gf-pgf/default.nix
@@ -8,4 +8,5 @@ stdenv.mkDerivation {
   inherit (gf-core) version meta;
   src = "${gf-core.src}/src/runtime/c";
   nativeBuildInputs = [autoreconfHook ];
+  broken = true;
 }
diff --git a/pkgs/ljtools/default.nix b/pkgs/ljtools/default.nix
new file mode 100644
index 0000000..2b8a03b
--- /dev/null
+++ b/pkgs/ljtools/default.nix
@@ -0,0 +1,42 @@
+{ qt5
+  , breakpointHook
+  , luajit
+  , stdenv
+  , fetchFromGitHub
+}:
+
+let
+  GuiTools-src = fetchFromGitHub {
+    owner = "rochus-keller";
+    repo = "GuiTools";
+    rev = "df36aa5c823d0c81259ae70b7c6f194c88017d6f";
+    hash = "sha256-RmpVkUjcAkde755QQwfWvC4sOxDLx2itmqw1T1DTOlE=";
+    name = "GuiTools";
+  };
+  LjTools-src = fetchFromGitHub {
+    owner = "rochus-keller";
+    repo = "LjTools";
+    name = "LjTools";
+    hash = "sha256-PWh1ZP5+hNXvDpJTaWtegHvcuBkdrZ6oA+bIkEikVHk=";
+    rev = "412675e2cc12bec1e00fd7a2ec52270f388d225b";
+  };
+  luajit-src = luajit.src.override { name = "LuaJIT"; };
+in stdenv.mkDerivation {
+  pname = "ljtools";
+  version = "0.1.0";
+  srcs = [
+    GuiTools-src
+    LjTools-src
+    luajit-src
+  ];
+  sourceRoot = "LjTools";
+  buildInputs = [
+    qt5.qtbase
+  ];
+  nativeBuildInputs = [
+    qt5.qtbase
+    breakpointHook
+    qt5.wrapQtAppsHook
+    qt5.qmake
+  ];
+}