repl.md

nix-repl> :b ((import ./sc3plugins.nix) {})
builder for '/nix/store/l3rp6m6ms4ramxa255hnmfr4gg7a58fw-sc3-plugins.drv' failed with exit code 1; last 10 log lines:
...
  installing
  ln: failed to access '/nix/store/1418n8dkkd9j8dnpzpw09wip6kz03b6z-sc3-plugins': No such file or directory
[0 built (1 failed)]
error: build of '/nix/store/l3rp6m6ms4ramxa255hnmfr4gg7a58fw-sc3-plugins.drv' failed

Why does ln fail above?

sc3plugins.nix

{ pkgs ? (import <nixpkgs> { }) }:
let name = "sc3-plugins";
in pkgs.stdenv.mkDerivation rec {

  inherit name;

  # https://github.com/supercollider/sc3-plugins/commit/7d08fab319198f27a5368307d0e9833c41b8053b
  # date = "2020-06-05T09=30=19-07:00";
  src = pkgs.fetchgit {
    url = "git@github.com:supercollider/sc3-plugins.git";
    rev = "7d08fab319198f27a5368307d0e9833c41b8053b";
    sha256 = "0qxn1dx9ccb5bkxx0mj2nxh5iqvk3xcx23rclqbc3kxv6gn41rwl";
    fetchSubmodules = true;
  };

  buildInputs = with pkgs; [ cmake supercollider fftw libsndfile ];

  cmakeFlags = with pkgs; [
    "-DSUPERNOVA=OFF"
    "-DSC_PATH=${supercollider}/include/SuperCollider"
    "-DFFTW3F_LIBRARY=${fftw}/lib/"
  ];

  installPhase = ''
    ln $out /home/ashesh/tmp/foo
  '';

}