It's used at build time in 23 crates (of which 6 optionally, 6 directly). It's used only as a dev dependency in 1 crate.

Depender (with downloads and own rev deps) build-deps version
1.1K 3 oqs-sys build ^0.1
1 smartnoise_validator build ^0.1.4
1 whitenoise_validator build ^0.1.4
1 rectangle-device-player build ^0.1.4
1 bandsocks build ^0.1
bandsocks-runtime build ^0.1.4