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doc/manual/src/hacking.md

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+# Hacking
+
+This section provides some notes on how to hack on Nix. To get the
+latest version of Nix from GitHub:
+
+    $ git clone https://github.com/NixOS/nix.git
+    $ cd nix
+
+To build Nix for the current operating system/architecture use
+
+    $ nix-build
+
+or if you have a flakes-enabled nix:
+
+    $ nix build
+
+This will build `defaultPackage` attribute defined in the `flake.nix`
+file. To build for other platforms add one of the following suffixes to
+it: aarch64-linux, i686-linux, x86\_64-darwin, x86\_64-linux. i.e.
+
+    $ nix-build -A defaultPackage.x86_64-linux
+
+To build all dependencies and start a shell in which all environment
+variables are set up so that those dependencies can be found:
+
+    $ nix-shell
+
+To build Nix itself in this shell:
+
+    [nix-shell]$ ./bootstrap.sh
+    [nix-shell]$ ./configure $configureFlags
+    [nix-shell]$ make -j $NIX_BUILD_CORES
+
+To install it in `$(pwd)/inst` and test it:
+
+    [nix-shell]$ make install
+    [nix-shell]$ make installcheck
+    [nix-shell]$ ./inst/bin/nix --version
+    nix (Nix) 2.4
+
+If you have a flakes-enabled nix you can replace:
+
+    $ nix-shell
+
+by:
+
+    $ nix develop