Installation is currently hit & miss on mac os

First, the proposed way to grab TinyInst doesn't work:

git clone --recurse-submodules git@github.com:googleprojectzero/TinyInst.git
Cloning into 'TinyInst'...
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

Changing to just use the https for the TinyInst repo works.

Second, when you try to build:

(base) cmp3149:Jackalope adg326$ cd build
(base) cmp3149:build adg326$ cmake -G Xcode ..
-- The C compiler identification is AppleClang 12.0.0.12000032
-- The CXX compiler identification is AppleClang 12.0.0.12000032
CMake Error at TinyInst/third_party/CMakeLists.txt:18 (project):
  No CMAKE_C_COMPILER could be found.



CMake Error at TinyInst/third_party/CMakeLists.txt:18 (project):
  No CMAKE_CXX_COMPILER could be found.



-- Configuring incomplete, errors occurred!
See also "/Users/adg326/Jackalope/build/CMakeFiles/CMakeOutput.log".

Start with the documented TinyInst clone command and TinyInst/third_party/CMakeLists.txt at line 18, then reproduce the macOS failure using cmake -G Xcode ... Verify that the HTTPS-based checkout works and that CMake can configure the project with the required C and C++ compilers.