On Linux, xforms frontend:

if g++ -DHAVE_CONFIG_H -I. -I. -I. -I../boost  -I/usr/X11R6/include  -O2 -fno-ex
ceptions -W -Wall -MT sgml.o -MD -MP -MF ".deps/sgml.Tpo" \
  -c -o sgml.o `test -f 'sgml.C' || echo './'`sgml.C; \
then mv -f ".deps/sgml.Tpo" ".deps/sgml.Po"; \
else rm -f ".deps/sgml.Tpo"; exit 1; \
fi
In file included from sgml.C:14:
sgml.h:35: invalid use of undefined type `struct std::string'
/usr/include/c++/3.2/bits/stringfwd.h:61: declaration of `struct std::string'
make[4]: *** [sgml.o] Error 1

                        ---Kayvan

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