nix package definition for development

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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
+#    --args pkgs /path/to/nixpkgs
+#
+
+{ pkgs ? null }:
+
+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 {};
+
+in with usepkgs; usepkgs.stdenv.mkDerivation rec {
+  src = ./.;
+  name = "gnunet-dev";
+
+  buildInputs = [
+    makeWrapper pkgconfig
+    adns curl gettext gmp gnutls gss ncurses openldap zlib sqlite mariadb postgresql
+    libextractor libgcrypt libgnurl libidn libmicrohttpd
+    libpsl libtool libunistring libxml2
+  ];
+
+  patchPhase = ''
+    test -e Makefile && make distclean
+  '';
+
+  configureFlags = [
+    "--enable-gcc-hardening"
+    "--enable-linker-hardening"
+
+    "--enable-experimental"
+    "--enable-logging=verbose"
+    "--enable-poisoning"
+  ];
+
+  preConfigure = ''
+    ./bootstrap
+    configureFlags="$configureFlags --with-nssdir=$out/lib"
+  '';
+
+  doCheck = false;
+
+  postInstall = ''
+    # Tests can be run this way
+    #export GNUNET_PREFIX="$out"
+    #export PATH="$out/bin:$PATH"
+    #make -k check
+  '';
+
+  meta = with stdenv.lib; {
+    description = "GNU's decentralized anonymous and censorship-resistant P2P framework";
+
+    longDescription = ''
+      GNUnet is a framework for secure peer-to-peer networking that
+      does not use any centralized or otherwise trusted services.  A
+      first service implemented on top of the networking layer
+      allows anonymous censorship-resistant file-sharing.  Anonymity
+      is provided by making messages originating from a peer
+      indistinguishable from messages that the peer is routing.  All
+      peers act as routers and use link-encrypted connections with
+      stable bandwidth utilization to communicate with each other.
+      GNUnet uses a simple, excess-based economic model to allocate
+      resources.  Peers in GNUnet monitor each others behavior with
+      respect to resource usage; peers that contribute to the
+      network are rewarded with better service.
+    '';
+
+    homepage = http://gnunet.org/;
+
+    license = licenses.gpl3Plus;
+    platforms = platforms.gnu;
+    maintainers = with maintainers; [ ];
+  };
+}