compiler standards (and/or min gcc version) supported with installed headers ?

[Mike Frysinger]

seems like something we should have spelled out in the manual and/or faq.  
what standards do we want to support with installed headers ?  and similarly, 
what min gcc version ?

going by features.h, it seems like we support very old standards, which means 
it should be easy to support old gcc versions too.  a quick grep on my system 
shows we have __GNUC_PREREQ(2,0).
-mike
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