Open SSL Error in common lisp using the drakma library when accessing secure sites

Question

I have the package drakma installed from quicklisp

Saying I am missing Unable to load any of the alternatives: ("libcrypto.so.1.1" "libcrypto.so.1.0.0" "libcrypto.so") [Condition of type CFFI:LOAD-FOREIGN-LIBRARY-ERROR]

when trying to access non secure sites I am able to do so perfectly fine. (drakma:http-request "http://www-formal.stanford.edu/jmc/")

however, any other site that I try to access give the error of No OpenSSL version number could be determined, both SSLeay and OpenSSL_version_num failed.

Example: (drakma:http-request "https://lisp.org")

Why am I getting this error for secure sites exactly? and what can I do to mitigate this

Answer 1

Drakma has cl+ssl as a dependency. That dependency is installed by Quicklisp, but cl+ssl itself has libssl-dev as a dependency. It turns out that libcrypto.so is a shared library that is distributed with libssl-dev.

libssl-dev is not a Common Lisp ASDF system, so you will have to install it yourself. The easiest way to do this would be to use a package manager, e.g., sudo apt-get install libssl-dev.