It appears that the files under /include/g++-3/ , as well as the stdc++ library files are not
included in the mingw-runtime distribution.
As far as I can tell, this makes it difficult or
impossible to compile programs using the std c++ library using the runtime
It also contributes to cygwin's g++ -mno-cygwin
option being somewhat worthless, since cygwin seems to rely on the mingw-runtime
distribution to provide headers & libs for the -mno-cygwin
Is this by design, or just an oversight? Could this
be changed in a future release?