It's used at build time in 12 crates.

Depender (with downloads and own rev deps) coin-build-tools version
4 coinutils-src build ^0.2
3 clp-src build ^0.2
3 osi-src build ^0.2
1 cgl-src build ^0.2
2 cbc-src build ^0.2
1 mumps-src build ^0.2
1 bonmin-src build ^0.2
coincbc-sys build ^0.2
2 ipopt-src build ^0.2
coinclp-sys build ^0.2
coinbonmin-sys build ^0.2
coinipopt-sys build ^0.2