OpenPoseをbuildしたい

前提・実現したいこと

当方MacBookPro2017を使用しているものです。

OpenPoseのソースコードをgitからダウンロードしてビルドを行おうとしているのですが、
make時にエラーが発生してしまいます。

ビルドはOpenPose配布元にある手順通りに行っています。
https://github.com/CMU-Perceptual-Computing-Lab/openpose/blob/master/doc/installation/0_index.md

発生している問題・エラーメッセージ

[ 12%] Performing configure step for 'openpose_lib'
CMake Warning (dev) at cmake/Misc.cmake:32 (set):
  implicitly converting 'BOOLEAN' to 'STRING' type.
Call Stack (most recent call first):
  CMakeLists.txt:25 (include)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Boost 1.54 found.
-- Found Boost components:
   system;thread;filesystem
-- Could NOT find GFlags (missing: GFLAGS_INCLUDE_DIR GFLAGS_LIBRARY) 
-- Could NOT find Glog (missing: GLOG_INCLUDE_DIR GLOG_LIBRARY)
CMake Error at /opt/local/share/cmake-3.14/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
Could NOT find Protobuf (missing: Protobuf_LIBRARIES Protobuf_INCLUDE_DIR)
Call Stack (most recent call first):
  /opt/local/share/cmake-3.14/Modules/FindPackageHandleStandardArgs.cmake:378 (_FPHSA_FAILURE_MESSAGE)
  /opt/local/share/cmake-3.14/Modules/FindProtobuf.cmake:594 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  cmake/ProtoBuf.cmake:4 (find_package)
  cmake/Dependencies.cmake:43 (include)
  CMakeLists.txt:49 (include)**


-- Configuring incomplete, errors occurred!
See also "/Users/***/openpose/build/caffe/src/openpose_lib-build/CMakeFiles/CMakeOutput.log".
See also "/Users/***/openpose/build/caffe/src/openpose_lib-build/CMakeFiles/CMakeError.log".
make[2]: *** [caffe/src/openpose_lib-stamp/openpose_lib-configure] Error 1
make[1]: *** [CMakeFiles/openpose_lib.dir/all] Error 2
make: *** [all] Error 2