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I can't properly understand the error or suggest a
patch, after trying for quite a long time.  Compiling
--without-cxx did not help.  I did find out that
CWERASE is meant to expand to CTRL('w') which is meant
to expand to (('w')&037).  There are #defines to do
this in /usr/include/sys/termios.h, and for things
like CWERASE, but they are controlled by #if
statements.  I agree that there could be problems with
SGI system header files, but it would be nice if
Python allowed for these.