[issue3754] cross-compilation support for python build

[Ray Donnelly]

Ray Donnelly <mingw.android at gmail.com> added the comment:

NCURSES_INTERNALS stuff appears to be redundant:

Mac OS X curses.h, Linux curses.h and Windows PDCurses.h don't reference it, nor does the Python 3.3.0b1 source code. Of course, I haven't checked any other systems.

However: see http://bugs.python.org/issue14598, so maybe for older Linux ncurses and Cygwin it is still needed.

NCURSES_OPAQUE investigation:

Linux ncurses.h:
#ifndef NCURSES_OPAQUE
#define NCURSES_OPAQUE 0
#endif

Mac OS X ncurses.h:
#ifndef NCURSES_OPAQUE
#define NCURSES_OPAQUE 1
#endif

So for OSX we need to be defining it to 0...

but IMHO, these parts are not directly related to cross compilation support so shouldn't be part of this patch.

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