Could not compile dependency :faker - could not make directory with -p

I can’t compile my dependencies anymore. I get this error:

sergiotapia at PapaMIA-A000039 in ~/Work/backend on develop
$ mix
==> faker
could not compile dependency :faker, “mix compile” failed. You can recompile this dependency with “mix deps.compile faker”, update it with “mix deps.update faker” or clean it with “mix deps.clean faker”
** (File.Error) could not make directory (with -p) “/opt/cache/_build/dev/lib/faker”: no such file or directory
(elixir) lib/file.ex:314: File.mkdir_p!/1

I tried to delete folders:

rm -rf deps/
rm -rf _build/

mix deps.get runs fine, then mix just fails with the error above.

Do I need to manually create the folder in /opt/ called cache? Why did this work before and why did it break suddenly? Appreciate any ideas.

Leaving this here for posterity, it was related to the BUILD_PATH env variable.

Something was setting it to /opt/cache/_build. Changing it to _build fixed my issue.

Now I need to hunt down what’s setting this thing.