CMake failure on macOS 10.15, and unresponsive menu at application startup

I'm trying to install juCi++ on my MacBook. I followed the install instructions at this was the output of cmake ..

-- The CXX compiler identification is AppleClang 11.0.0.11000033
-- Check for working C compiler: /Library/Developer/CommandLineTools/usr/bin/cc
-- Check for working C compiler: /Library/Developer/CommandLineTools/usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /Library/Developer/CommandLineTools/usr/bin/c++
-- Check for working CXX compiler: /Library/Developer/CommandLineTools/usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Error at /usr/local/Cellar/cmake/3.16.2/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:146 (message):
  Could NOT find LibClang (missing: LIBCLANG_LIBRARY LIBCLANG_INCLUDE_DIR)
Call Stack (most recent call first):
  /usr/local/Cellar/cmake/3.16.2/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:393 (_FPHSA_FAILURE_MESSAGE)
  lib/libclangmm/cmake_modules/FindLibClang.cmake:104 (find_package_handle_standard_args)
  lib/libclangmm/CMakeLists.txt:16 (find_package)


-- Configuring incomplete, errors occurred!
See also "/Users/Bob/Desktop/jucipp/build/CMakeFiles/CMakeOutput.log".