Hey @mikeudin,
we are aware and working on it. Meanwhile this applies:
Getting Started with the Cinema 4D C++ SDK on macOS: Prerequisites:
Xcode 13 is incompatible with more recent versions of macOS such as Ventura and Sonoma. But you must still use Xcode 13 to build the more recent Cinema 4D C++ SDKs for macOS, as Xcode 13 is the last release that supports the legacy build system. We strongly recommend using macOS Monterey to run Xcode 13 as the circulating hack of reaching into the Xcode 13 package to directly invoke the Xcode app is more and more error prone the further you update macOS. Attempting to build the Cinema 4D SDK with Xcode 14 or later will result in build errors. We are working on supporting the standard build system of Xcode.
See also the forum thread Development requirements for C4D 2025.
Cheers,
Ferdinand