this derivation will be built:
  /nix/store/j0nyky025i1jdc0xgv1gc99zrrd3y8l1-site-env-15.drv
building '/nix/store/j0nyky025i1jdc0xgv1gc99zrrd3y8l1-site-env-15.drv'
site-env-15> created 1 symlinks in user environment