I am trying to add my smart card PIV cert to ssh-agent. In macOS 10.15 Catalina, it was as simple as: ssh-add -s /usr/lib/ssh-keychain.dylib But in macOS 11.1 Big Sur, the ssh-agent debug output says: failed PKCS#11 add of "/usr/lib/ssh-keychain.dylib": realpath: No such file or directory I am aware that macOS 11 caches system libraries ... but I believe that /usr/lib/ssh-keychain.dylib is in the cache. Any help would be greatly appreciated!