[exim] Idea: Predefined macros

What do you think about having certain predefined macros available? One such
macro could be CONFDIR, and I can also imagine macros that are defined
according to which features are compiled in.

The point of these macros would be enabling the writing of more reusable
configuration files/snippets, and for the macros being macros is so they can
be used .include and .ifdef directives, and also in settings that aren't
expanded.

-- 
Magnus Holmgren        holmgren@???
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