xdragon: Init at 1.1.1

The package is renamed from `dragon` to prevent name conflicts with the
existing package as recommended in [1].

1: https://github.com/mwh/dragon/issues/17

pkgs/applications/misc/xdragon/default.nix

@@ -0,0 +1,28 @@
+{ stdenv, fetchFromGitHub, pkg-config, gtk3 }:
+
+stdenv.mkDerivation rec {
+  pname = "xdragon";
+  version = "1.1.1";
+
+  src = fetchFromGitHub {
+    owner = "mwh";
+    repo = "dragon";
+    rev = "v${version}";
+    sha256 = "0fgzz39007fdjwq72scp0qygp2v3zc5f1xkm0sxaa8zxm25g1bra";
+  };
+
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs = [ gtk3 ];
+
+  installFlags = [ "PREFIX=${placeholder "out"}/bin" ];
+  postInstall = ''
+    ln -s $out/bin/dragon $out/bin/xdragon
+  '';
+
+  meta = with stdenv.lib; {
+    description = "Simple drag-and-drop source/sink for X (called dragon in upstream)";
+    homepage = "https://github.com/mwh/dragon";
+    license = licenses.gpl3;
+    maintainers = with maintainers; [ das_j ];
+  };
+}

pkgs/top-level/all-packages.nix

@@ -26872,6 +26872,8 @@ in
 
   sift = callPackage ../tools/text/sift { };
 
+  xdragon = lowPrio (callPackage ../applications/misc/xdragon { });
+
   xlockmore = callPackage ../misc/screensavers/xlockmore { };
 
   xtrlock-pam = callPackage ../misc/screensavers/xtrlock-pam { };