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Indeed, the compiler I have has version gcc-3.3.4, and this mismatches with gcc-3.4.3, also

How should I avoid this problem? Why having that precise requirement of GCC version?

Sorry, that bundle is the output from our nightly build process, and we sometimes test specific gcc versions to ensure compatibility. You can use '-pgmc gcc-3.3.4', or build the sources yourself using ghc 6.4.1.

thanks. I was only afraid that it was newly introduced incompatibility, thanks for explanations. There *is* newly introduced incompatibility, though, so PUGS is not built with a following message: .... No context is allowed on a GADT-style data declaration (You can put a context on each contructor, though.) Build failed: 256 at util/build_pugs.pl line 86. But this is probably a subject of different question. Best regards, Vadim.