these 3 derivations will be built:
  /nix/store/d6m588rjwzp68bkwj7b54gsjkqdqng71-source.drv
  /nix/store/ky998iysizdxs44xig4gxm1vpb9bllh1-iets-deps-riscv64-unknown-linux-gnu-0.1.0.drv
  /nix/store/fdnkcgjv2s0d57mxdpsj1gjlaqnsiqn3-iets-riscv64-unknown-linux-gnu-0.1.0.drv