Q: meaning of CPP flags in ROOT sources

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Hello Rooters,
	trying to build ROOT for a platform/compiler architecture
for which there is no Makefile available in the distribution, I realized 
that there are several CPP flags which meaning is quite obscure and I have 
to choose between them almost blindly. It would be very nice if their meaning 
were explained. In particular:

- why building ROOT on Linux or IRIX one has to turn ON G__OSFDLL and 
  G__DECCXX flags? If these flags have more general meaning than 
  just selection of DEC/OSF-specific features, wouldn't it be a good idea
  to rename them appropriately?
  
- what is the difference between G__REGEXP and G__REGEXP1 flags? How one can
  decide which one to choose?

					thanks a lot, pasha

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