Problem:
configure: error: ssl is required but missing
Solution:
sudo yum install openssl-devel
Note that on other Linux flavors (this was Centos6) this package may be named differently, for example openssl-dev orso. Try openssl* to see a list, then hit CTRL-C after getting the name.
In a similar way, if you get:
configure: error: lzo enabled but missing
Then do:
sudo yum install lzo-devel