rust.nix

{
  buildPhase = ''
    runHook preBuild

    export NIX_RUST_BUILD_FLAGS=
    for dep in $nativeBuildInputs $propagatedNativeBuildInputs; do
      if [ -e "$dep/lib/.cargo/link-flags" ]; then
        NIX_RUST_BUILD_FLAGS+=" $(< $dep/lib/.cargo/link-flags)"
      fi
      if [ -e "$dep/lib/.cargo/env" ]; then
        . "$dep/lib/.cargo/env"
      fi
    done

    export NIX_RUST_FLAGS=
    for dep in $buildInputs $propagatedBuildInputs; do
      if [ -e "$dep/lib/.cargo/link-flags" ]; then
        NIX_RUST_FLAGS+=" $(< $dep/lib/.cargo/link-flags)"
      fi
    done
  '';
}