[CLOSED] Debian Stretch: OpenSSL library not found

I’m on a freshly installed Debian Stretch with Cinnamon Desktop Environment.
Installed all the dependencies listed here: http://help.whatpulse.org/kb/client/linux-installation
I also made sure that libssl-dev is installed:

dpkg -l | grep ‘openssl|libssl-dev’

ii libssl-dev:amd64 1.1.0c-2 amd64
ii openssl 1.1.0c-2 amd64

But I still get the error message “AES functions not available. Is OpenSSL library present?”.
Do I need some symlinks? Where does Whatpulse look for the library?

Closing in favor of: http://whatpulse.org/forums/showthread.php?tid=7783