Apache httpd/variables/Define
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About
Defines are configuration variables which can be defined either in the command line or within configuration files.
Within a config file, the <Define> directive is used to define a variable (optionally giving it a value, and the <IfDefine> directive allows sections of config code to be selectively executed.
The <IfDefine> directive supports an optional "!" prefix on its sole parameter, which means "does not exist" rather than "is not true".