pyenv installがエラーで進まないときの対処法

はじめに

pyenvでpythonのバージョンを変えようと思い別バージョンをインストールした矢先エラーが置きたので対処した手順をメモ
環境: MacOS Mojave バージョン 10.14.6

起こったエラー

$pyenv install 3.6.4

python-build: use openssl from homebrew
python-build: use readline from homebrew
Downloading Python-3.6.4.tar.xz...
-> https://www.python.org/ftp/python/3.6.4/Python-3.6.4.tar.xz
Installing Python-3.6.4...
python-build: use readline from homebrew

BUILD FAILED (OS X 10.14.6 using python-build 20160602)

Inspect or clean up the working tree at /var/folders/_4/hss19f1x2b12ys793gz8lsd00000gn/T/python-build.20191218170128.37056
Results logged to /var/folders/_4/hss19f1x2b12ys793gz8lsd00000gn/T/python-build.20191218170128.37056.log

Last 10 log lines:
  File "/private/var/folders/_4/hss19f1x2b12ys793gz8lsd00000gn/T/python-build.20191218170128.37056/Python-3.6.4/Lib/ensurepip/__main__.py", line 5, in <module>
    sys.exit(ensurepip._main())
  File "/private/var/folders/_4/hss19f1x2b12ys793gz8lsd00000gn/T/python-build.20191218170128.37056/Python-3.6.4/Lib/ensurepip/__init__.py", line 204, in _main
    default_pip=args.default_pip,
  File "/private/var/folders/_4/hss19f1x2b12ys793gz8lsd00000gn/T/python-build.20191218170128.37056/Python-3.6.4/Lib/ensurepip/__init__.py", line 117, in _bootstrap
    return _run_pip(args + [p[0] for p in _PROJECTS], additional_paths)
  File "/private/var/folders/_4/hss19f1x2b12ys793gz8lsd00000gn/T/python-build.20191218170128.37056/Python-3.6.4/Lib/ensurepip/__init__.py", line 27, in _run_pip
    import pip
zipimport.ZipImportError: can't decompress data; zlib not available
make: *** [install] Error 1

やったこと

$ brew install zlib
$ brew install sqlite
$ export LDFLAGS="${LDFLAGS} -L/usr/local/opt/zlib/lib"
$ export CPPFLAGS="${CPPFLAGS} -I/usr/local/opt/zlib/include"
$ export LDFLAGS="${LDFLAGS} -L/usr/local/opt/sqlite/lib"
$ export CPPFLAGS="${CPPFLAGS} -I/usr/local/opt/sqlite/include"
$ export PKG_CONFIG_PATH="${PKG_CONFIG_PATH} /usr/local/opt/zlib/lib/pkgconfig"
$ export PKG_CONFIG_PATH="${PKG_CONFIG_PATH} /usr/local/opt/sqlite/lib/pkgconfig"

結果

$ python --version
Python 2.7.13 :: Anaconda custom (x86_64)

$ pyenv install 3.6.4

$ pyenv global 3.6.4

$ python --version
Python 3.6.4