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+Perform the following steps:
+
+```text
+$ git clone https://github.com/mmgen/mmgen-wallet.git
+$ cd mmgen-wallet
+$ mkdir -p ~/.mmgen
+$ cp nix/user-packages.nix ~/.mmgen
+```
+
+For altcoin support, edit `~/.mmgen/user-packages.nix` to taste, uncommenting
+the relevant lines for whatever support you require.  For a BTC-only setup,
+you can leave the file untouched.
+
+Build required derivations and enter the custom Nix shell environment:
+
+```text
+$ nix-shell nix # for full isolation, add the ‘--pure’ option
+```
+
+Within nix-shell you may now test and use MMGen Wallet as with any normal
+installation.
+
+Refer to `nix/README` in the MMGen Wallet repo for more information, including
+a speedup tip and instructions for installation on NixOS.