Webmaster in a Nutshell, Third Edition

Name

<IfDefine>

Synopsis

                     <IfDefine>
                     ...
                     </IfDefine>
                  

A sectioning directive for specifying directives that apply if a given define is entered on the command line. For example:

<IfDefine MD5Digest>
LoadModule mod_digest libexec/moddigest.so
</IfDefine>

This directive is executed if the Apache server is started using the following command line parameter:

httpd -DMD5Digest ...

Note that you can place an exclamation mark in front of the <IfDefine> parameter to include such directives if a definition is not made on the command line.