errors building python 2.7.3

David Robinow drobinow at
Wed Mar 28 17:42:55 CEST 2012

On Wed, Mar 28, 2012 at 7:50 AM, Alexey Luchko <luch at> wrote:
> I've tried to build Python 2.7.3rc2 on cygwin and got the following errors:
> $ CFLAGS=-I/usr/include/ncursesw/ CPPFLAGS=-I/usr/include/ncursesw/
> ./configure
 I haven't tried 2.7.3 yet, so I'll describe my experience with 2.7.2
 I use /usr/include/ncurses   rather than /usr/include/ncursesw
 I don't remember what the difference is but ncurses seems to work.

> $ make
> ...
> gcc -shared -Wl,--enable-auto-image-base
> build/temp.cygwin-1.7.11-i686-2.7/Python-2.7.3rc2/Modules/_io/bufferedio.o
> build/temp.cygwin-1.7.11-i686-2.7/Python-2.7.3rc2/Modules/_io/bytesio.o
> build/temp.cygwin-1.7.11-i686-2.7/Python-2.7.3rc2/Modules/_io/fileio.o
> build/temp.cygwin-1.7.11-i686-2.7/Python-2.7.3rc2/Modules/_io/iobase.o
> build/temp.cygwin-1.7.11-i686-2.7/Python-2.7.3rc2/Modules/_io/_iomodule.o
> build/temp.cygwin-1.7.11-i686-2.7/Python-2.7.3rc2/Modules/_io/stringio.o
> build/temp.cygwin-1.7.11-i686-2.7/Python-2.7.3rc2/Modules/_io/textio.o
> -L/usr/local/lib -L. -lpython2.7 -o build/lib.cygwin-1.7.11-i686-2.7/_io.dll
> build/temp.cygwin-1.7.11-i686-2.7/Python-2.7.3rc2/Modules/_io/bufferedio.o:
> In function `_set_BlockingIOError':
> /Python-2.7.3rc2/Modules/_io/bufferedio.c:579: undefined reference to
> `__imp__PyExc_BlockingIOError'

In Modules/_io/_iomodule.h, use:
PyObject *PyExc_BlockingIOError;
instead of:
PyAPI_DATA(PyObject *) PyExc_BlockingIOError;

> Failed to build these modules:
> _curses            _io

But please note that Cygwin does not support Python-2.7. There may be
other reasons.
I don't really use cygwin Python for anything important. It's just
nice to have around since I spend a lot of time in the bash shell.
It would probably be helpful to ask on the Cygwin mailing list

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