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diff --git a/default.nix b/default.nix
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+# Nix package for GNUnet development
+#
+## INSTALL
+#
+# To build and install the package in the user environment, use:
+#
+# $ nix-env -f . -i
+#
+## BUILD ONLY
+#
+# To build the package and add it to the nix store, use:
+#
+# $ nix-build
+#
+## SHELL
+#
+# To launch a shell with all dependencies installed in the environment, use one of the following:
+#    $ nix-shell
+#
+# After entering nix-shell, build it:
+#
+# $ configurePhase
+# $ buildPhase
+#
+## NIXPKGS
+#
+# For all of the above commands, nixpkgs to use can be set the following way:
+#
+# a) by default it uses nixpkgs pinned to a known working version
+#
+# b) use nixpkgs from the system:
+#    --arg pkgs 0
+#
+# c) use nixpkgs at a given path
+#    --arg pkgs /path/to/nixpkgs
+#
+## CCACHE
+#
+# To enable ccache, use the following:
+#
+#    --argstr ccache_dir /var/cache/ccache
+
+# or when using nix-shell:
+#    --argstr ccache_dir ~/.ccache
+#
+# and make sure the given directory is writable by the nixpkgs group when using nix-build or nix-env -i,
+# or the current user when using nix-shell
+#
+
+{
+ pkgs ? null,
+ ccache_dir ? "",
+}:
+
+let
+  syspkgs = import <nixpkgs> { };
+  pinpkgs = syspkgs.fetchFromGitHub {
+    owner = "NixOS";
+    repo = "nixpkgs";
+
+    # binary cache exists for revisions in https://nixos.org/releases/nixos/<release>/<build>/git-revision
+    rev = "c4469edac1fc1fa5e5b5aa2ceadeda8f3f92d30a"; # https://nixos.org/releases/nixos/16.09/nixos-16.09beta430.c4469ed/git-revision
+    sha256 = "1x6hmf815d5anfxrxl6iivfkk60q5qxa6waa9xnwhwkbc14rhvn9";
+  };
+  usepkgs = if null == pkgs then
+             import pinpkgs {}
+            else
+              if 0 == pkgs then
+                import <nixpkgs> { }
+              else
+                import pkgs {};
+  stdenv = usepkgs.stdenvAdapters.keepDebugInfo usepkgs.stdenv;
+
+in {
+    gnunet-dev = usepkgs.callPackage ./gnunet/gnunet-dev.nix {
+      inherit ccache_dir;
+    };
+  taler-exchange-dev = usepkgs.callPackage ./taler-exchange-dev.nix {
+    inherit ccache_dir;
+    gnunet-dev = usepkgs.callPackage ./gnunet/gnunet-dev.nix {
+      inherit ccache_dir;
+    };
+  };
+}