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 5 Conditionals, loops, and recursion
 ************************************
 
 Macros, expanding to plain text, perhaps with arguments, are not quite
 enough.  We would like to have macros expand to different things, based
 on decisions taken at run-time.  For that, we need some kind of
 conditionals.  Also, we would like to have some kind of loop construct,
 so we could do something a number of times, or while some condition is
 true.
 

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* Ifdef                       Testing if a macro is defined
* Ifelse                      If-else construct, or multibranch
* Loops                       Loops and recursion in m4
 

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