I noticed one of my targets, which links directly to libcrypto, fails to link on Xcode 8 because the macOS 12 SDK doesn't, I guess, include libcrypto.
It looks like libcrypto on macOS 12 is still present in /usr/lib/
In Xcode 8 I can just remove the libcrypto library dependency, and it all seems to link fine. But will this keep working if I'm building the project on Xcode 7 with an earlier SDK?