# Pastebin U1zwWODt
hi! I'm trying to update a go program I have to build with nixpkgs unstable instead of `20.03`, but I'm facing some issues that I don't really understand. For all of my dependencies, I'm getting an error message:
```
Building subPackage ./.
ethsign.go:7:3: cannot find package "." in:         /private/var/folders/fb/0m3l_cnn4w57fhsv7q_lx5780000gn/T/nix-build-ethsign-0.16.0.drv-0/ethsign/vendor/github.com/ethereum/go-ethereum/accounts
```
when running `nix-build`. Has anyone seen this before? What has changed since `20.03` in the way one builds go modules?