Re:

Oleg Broytmann <phd@sun.med.ru> writes:
> gcc -O2  -I../../backend -I../../include -I../../interfaces/libpq -fPIC   -c pgconnection.cc
> In file included from pgconnection.cc:18:
> pgconnection.h:76: syntax error before `('

Hmm.  Something broken about "string"?

My guess is that configure didn't think it should define
HAVE_CXX_STRING_HEADER, but that is actually necessary on your
machine.  Please look into it.

            regards, tom lane