Include headers in cxx_build include() brought in by a dependency within target/ sub-directory?

I have headers like `target/release/build/joltc-sys-cbcdf0340a740e35/out/include/Jolt/Physics/PhysicsSystem.h` I'd like to use with `cxx_build::bridge(...).include()`, but that hash is not going to be consistent (where joltc-sys is the name of the dependency, my project is name something else).  Is there a way to find out what the right path is within build.rs?