Mac when /eosio_build.sh

[AdwindOne]

CMake Error at libraries/wasm-jit/Source/Runtime/CMakeLists.txt:26 (find_package):
Could not find a package configuration file provided by "LLVM" (requested
version 4.0) with any of the following names:

LLVMConfig.cmake
llvm-config.cmake

Add the installation prefix of "LLVM" to CMAKE_PREFIX_PATH or set
"LLVM_DIR" to a directory containing one of the above files. If "LLVM"
provides a separate development package or SDK, be sure it has been
installed.

-- Configuring incomplete, errors occurred!
See also "/Users/yunlong/Applications/eos/build/CMakeFiles/CMakeOutput.log".

>>>>>>>>>>>>>>>>>>>> CMAKE building EOSIO has exited with the above error.

[jgiszczak]

See #43 for repair procedures.