When you compile elog from the soruces, you need the OpenSSL library to be installed. The CMake build process will then find it and include it in the compile process. When you use the "make" build process, you have to make sure that SSL is enabled there:
USE_SSL = 1
To install the OpenSSL library, you can do on most systems something like "sudo yum install openssl-dev" or "sudo apt-get install openssl-dev"
I installed the latest elog (3.1.4-2) in CentOS 7, and it is working well without SSL.
When I enalbled SSL option (SSL = 1) in the "elogd.cfg", and tried to start the elogd, the message below was shown and failed to run.
SSL support not compiled into elogd
If I switched the elog to older one (3.1.4-1), I could successeed to run the elogd with SSL option.
Is there any other option required in the latest elog to run with SSL? Or is this bug in the latest version?