Add liquid

pkgs/liquidd.nix

@@ -0,0 +1,45 @@
+{ stdenv, fetchurl, pkgconfig, autoreconfHook, openssl, db48, boost, zeromq
+, zlib, miniupnpc, qtbase ? null, qttools ? null, utillinux, protobuf, python3, qrencode, libevent
+}:
+
+with stdenv.lib;
+stdenv.mkDerivation rec{
+  name = "liquid-" + version;
+  version = "3.14.1.21";
+
+  src = fetchurl {
+    urls = [
+            "https://github.com/Blockstream/liquid/releases/download/liquid.${version}/liquid-${version}.tar.gz"
+           ];
+    sha256 = "0fb17de2ac7169a69980f0417007263d439f6bd7045549621c1877178bac8b23";
+  };
+
+  nativeBuildInputs = [ pkgconfig autoreconfHook ]
+                   ++ optionals doCheck [ python3 ];
+  buildInputs = [ openssl db48 boost zlib zeromq
+                  miniupnpc protobuf libevent]
+                  ++ optionals stdenv.isLinux [ utillinux ];
+
+  configureFlags = [ "--with-boost-libdir=${boost.out}/lib"
+                     "--disable-bench"
+                   ] ++ optionals (!doCheck) [
+                     "--disable-tests"
+                     "--disable-gui-tests"
+                   ];
+  doCheck = true;
+
+  enableParallelBuilding = true;
+
+  meta = {
+    description = "An inter-exchange settlement network based on Bitcoin";
+    longDescription= ''
+      Liquid is an inter-exchange settlement network linking together cryptocurrency exchanges and
+      institutions around the world, enabling faster Bitcoin transactions and the issuance of
+      digital assets.
+    '';
+    homepage = http://www.github.com/blockstream/liquid;
+    license = licenses.mit;
+    # liquid needs hexdump to build, which doesn't seem to build on darwin at the moment.
+    platforms = platforms.linux;
+  };
+}