Added Arch and NixOS install instructions (#33)

* Added Arch and NixOS install instructions

* Added shell.nix

README.md

@@ -76,6 +76,10 @@ and it will do the rest.
 
 I've created issues for some of the missing functionality. Most importantly more email formats (as explained above). Beyond that, there're probably bugs, there's a certain lack of tests and documentation, the [windows build is on shaky grounds](https://github.com/terhechte/postsack/issues/20), [the light theme is wonky](https://github.com/terhechte/postsack/issues/15), [some parts need a healthy refactoring to be useful beyond Postsack](https://github.com/terhechte/postsack/issues/11), [and it would be great if the binaries could be generated from the Github actions](https://github.com/terhechte/postsack/issues/10).
 
+## Installation
+
+For macOS, Linux or Windows install instructions, [please refer to the Readme in the postsack-native folder](postsack-native/Readme.md)
+
 ## Deploying to crates.io for `cargo install`
 
 One of the issues I ran into was that many of the emails I had received over the years were not

postsack-native/Readme.md

@@ -33,6 +33,19 @@ sudo dnf install @development-tools glib cairo-devel pango-devel gdk-pixbux2-dev
 sudo apt-get install libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev libspeechd-dev libxkbcommon-dev libssl-dev libsqlite3-dev
 ```
 
+### Arch based
+
+Thanks to Emilio Reggi, [there's an Arch package here](https://aur.archlinux.org/packages/postsack-bin/)
+
+### NixOS
+
+There's a `shell.nix` in this directory. It can be used to run Postsack on NixOS via:
+
+``` sh
+> nix-shell shell.nix
+$ cargo run
+```
+
 ### Building
 
 ``` sh

postsack-native/shell.nix

@@ -0,0 +1,16 @@
+with import <nixpkgs> {};
+
+stdenv.mkDerivation {
+  name = "postsack-env";
+  buildInputs = [
+    rustc cargo xorg.libxcb
+  ];
+  LD_LIBRARY_PATH = lib.makeLibraryPath [
+    xorg.libxcb
+    xorg.libX11
+    xorg.libXcursor
+    xorg.libXrandr
+    xorg.libXi
+    libglvnd
+  ];
+}