Issues installing python versions through pyenv on macOS mojave

[karalekas]

some related issues and pages:

• pyenv/pyenv#1219
• https://github.com/pyenv/pyenv/wiki/Common-build-problems
• https://github.com/pyenv/pyenv/wiki#suggested-build-environment

[karalekas]

following the instructions above, I was able to suppress the zlib issue but then started seeing a new OpenSSL issue. came across this issue pyenv/pyenv#1184, and was finally able to get installation to work. thus, the steps were:

• install headers that are missing in mojave

sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg -target /

• set the CONFIGURE_OPTS environment variable

CONFIGURE_OPTS="--with-openssl=$(brew --prefix openssl)" pyenv install 3.7.0

NOTE: I did not set any C compiler or linker flags.