This is used to process some section in httpd.conf based on the system argument.
The directives within an <ifdefine></ifdefine> section are only processed if the "test" variable is true. If "test" variable is false, everything between the start and end markers is ignored.
Example:
httpd -D test -k start
Starting the httpd with system parameter "test" will execute the below section or else it will skip those
<ifdefined>
...
...
</ifdefined>
This will be useful sometime when you try loading modules on specific arguments.
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