HookCase requires a compatible version of OS X -- OS X 10.9
(Mavericks) through macOS 13 (Ventura). Building it also requires a
relatively recent version of XCode. I recommend building on the
version of OS X where you'll be using HookCase, and using the most
recent version of XCode available for that version. But the version
of XCode you use must contain an SDK matching the version of macOS/OS
X on which you're building. Check in the
Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs
directory of your XCode.app package.
Building HookCase.kext should be straightforward. I ususally just
run xcodebuild from the command line. This drops a release build
into the project's build/Release/ subdirectory.
On macOS 10.13 (HighSierra) and below, building some hook libraries
requires additional tools, like llvm-as and llc, which aren't
provided with XCode. But they do come with third party distros like
the LLVM 3.9.0 Clang download or
the LLVM 4.0.0 Clang download.