m4 is not well-loved, but it's strength is that it is available (i.e. typically present) on virtually any Unix system.
If you're choosing between macro processors to use, m4 is a good choice simply because it is so ubiquitous.
Aside from mentioning autoconf and perhaps sendmail, there's not much else to say about it. You're probably never going to write a config file for sendmail (I do not miss sendmail, and you should be using either postfix or exim instead), but you might do something with autoconf.
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Anonymous2011-11-29 20:18
inb4 m4 fibs
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Anonymous2013-09-01 13:36
Just in case anyone hasn't already heard: TH14 has been announced, surprising absolutely no one. As this is ostensibly a Touhou themed board, I thought it might be appropriate that there be at least one thread about this.
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Anonymous2013-09-01 15:07
What sort of personality traits do you like best for a loli?