# Quickstart Set the `OK_FRONTPANEL_DIR` environment variable to point to the `FrontPanel/API` directory. This should be the location of the `okFrontPanel.h` header file. ## Mac OS X Set the `DYLD_FALLBACK_LIBRARY_PATH` environment variable to point to the same directory. You can do ```shell export DYLD_FALLBACK_LIBRARY_PATH=$OK_FRONTPANEL_DIR ``` Then the usual `cargo build` and `cargo test` should work.