Possible solution for openssl header file missing issue while installing REDI from source.

[ash-kai]

While installing REDI from the source, if you face the error:
"openssl/opensslv.h' file not found"
One of the solution is to try to uninstall openssl and then reinstall through brew.
However when you reinstall through brew it does not create symlinks (because of which other applications may find it hard to locate openssl header files)
If you build your own software and it requires this formula, you'll need to add to your build variables: LDFLAGS: -L/usr/local/opt/openssl/lib CPPFLAGS: -I/usr/local/opt/openssl/include
This should resolve the above issue.

[nrejackufl]

Thanks for opening the issue. More info: This is seen on Mac OS X (note usage of brew).

[nrejackufl]

This problem can also be avoided by upgrading pip to >8.1.2 and manually installing cryptography:
pip install cryptography.

This installs directly from the wheel and avoids having to compile cryptography from source.