1 new commit pushed to

<https://github.com/efabless/openlane2/tree/main|main>

by donn

<https://github.com/efabless/openlane2/commit/8b47c810ae47835079e09bbec8ff945c4b90b14a|8b47c810>

- Fix preprocessor using external dir:: (#137) efabless/openlane2