what is meant by devel for openssl?

You’re correct – it’s short for “development package”.

For Linux, you need a command like this:

yum install openssl openssl-devel # for Redhat/Centos/openSUSE

apt-get install openssl openssl-dev # for Debian/Ubuntu

Note: these commands use the “package manager” to install both openssl (which it sounds like you already have: but it wouldn’t hurt to do an install), and openssl-devel.

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