MAC cannot compile

-- Could NOT find SWIG (missing: SWIG_EXECUTABLE SWIG_DIR) (Required is at least version "3.0")
INFO Python libraries or swig not found, skipping swig builds
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/yantao/Desktop/kujiale/code/build-openvpn3/test/unittests/googletest-download
[ 11%] Performing update step for 'googletest'
[ 22%] No patch step for 'googletest'
[ 33%] No configure step for 'googletest'
[ 44%] No build step for 'googletest'
[ 55%] No install step for 'googletest'
[ 66%] No test step for 'googletest'
[ 77%] Completed 'googletest'
[100%] Built target googletest
lzo not found, skipping lzo compression tests
CMake Error at /opt/homebrew/Cellar/cmake/3.23.1/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:230 (message):
Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE)
Call Stack (most recent call first):
/opt/homebrew/Cellar/cmake/3.23.1/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:594 (_FPHSA_FAILURE_MESSAGE)
/opt/homebrew/Cellar/cmake/3.23.1/share/cmake/Modules/FindPkgConfig.cmake:99 (find_package_handle_standard_args)
cmake/findcoredeps.cmake:144 (find_package)
test/ovpncli/CMakeLists.txt:62 (add_json_library)

❯ cat CMakeFiles/CMakeError.log
Compiling the C compiler identification source file "CMakeCCompilerId.c" failed.
Compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc
Build flags:
Id flags:

The output was:
1
ld: library not found for -lSystem
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++
Build flags:
Id flags:

The output was:
1
ld: library not found for -lc++
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Start with cmake/findcoredeps.cmake:144 and test/ovpncli/CMakeLists.txt:62, then review CMakeFiles/CMakeError.log for the missing PkgConfig and system libraries. Reproduce the macOS configure/build and determine whether the dependency or compiler setup is the failure; done means the project configures and compiles successfully on macOS.