ModSecurity for Apache 2.4.34 Failing with Invalid command ‘SecRuleEngine’

I have A Ubuntu 18.04 server, installed Apache 2.4.34, and have compiled ModSecurity 3 with the apache module.

I can successfully load the module, by adding:

LoadModule security3_module modules/mod_security3.so

to my httpd.conf

and testing with httpd -M shows the module is loading

enter image description here

My config is standard, nothing other than pulling from the v3 rules repo, and moving the config files around to where they should go.

As soon as I attempt to load the config I receive:

AH00526: Syntax error on line 7 of /opt/ModSecurity/modsecurity.conf: Invalid command 'SecRuleEngine', perhaps misspelled or defined by a module not included in the server configuration 

and my config is simply:

<IfModule security3_module>     IncludeOptional /opt/ModSecurity/modsecurity.conf </IfModule> 

Where /opt/ModSecurity/modsecurity.conf contains the standard stuff from the repo.

What am I doing wrong?

(let me know if you need more info)