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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