$ CFLAGS=-I/usr/include/ncursesw/ CPPFLAGS=-I/usr/include/ncursesw/ ./configure
$ make 
...
building '_curses' extension
gcc -fno-strict-aliasing -I/usr/include/ncursesw/ -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I. -IInclude -I./Include -I/usr/include/ncursesw/ -I/Python-2.7.3rc2/Include -I/Python-2.7.3rc2 -c /Python-2.7.3rc2/Modules/_cursesmodule.c -o build/temp.cygwin-1.7.11-i686-2.7/Python-2.7.3rc2/Modules/_cursesmodule.o
/Python-2.7.3rc2/Modules/_cursesmodule.c: In function ‘PyCursesWindow_EchoChar’:
/Python-2.7.3rc2/Modules/_cursesmodule.c:810:18: error: dereferencing pointer to incomplete type
/Python-2.7.3rc2/Modules/_cursesmodule.c: In function ‘PyCursesWindow_NoOutRefresh’:
/Python-2.7.3rc2/Modules/_cursesmodule.c:1238:22: error: dereferencing pointer to incomplete type
/Python-2.7.3rc2/Modules/_cursesmodule.c: In function ‘PyCursesWindow_Refresh’:
/Python-2.7.3rc2/Modules/_cursesmodule.c:1381:22: error: dereferencing pointer to incomplete type
/Python-2.7.3rc2/Modules/_cursesmodule.c: In function ‘PyCursesWindow_SubWin’:
/Python-2.7.3rc2/Modules/_cursesmodule.c:1448:18: error: dereferencing pointer to incomplete type
/Python-2.7.3rc2/Modules/_cursesmodule.c: In function ‘PyCursesWindow_Refresh’:
/Python-2.7.3rc2/Modules/_cursesmodule.c:1412:1: warning: control reaches end of non-void function
/Python-2.7.3rc2/Modules/_cursesmodule.c: In function ‘PyCursesWindow_NoOutRefresh’:
/Python-2.7.3rc2/Modules/_cursesmodule.c:1270:1: warning: control reaches end of non-void function
/Python-2.7.3rc2/Modules/_cursesmodule.c: In function ‘PyCursesWindow_EchoChar’:
/Python-2.7.3rc2/Modules/_cursesmodule.c:817:1: warning: control reaches end of non-void function

CYGWIN_NT-6.1-WOW64 ... 1.7.11(0.260/5/3) 2012-02-24 14:05 i686 Cygwin
gcc version 4.5.3 (GCC) 

Python 2.7.2 & 2.7.3rc2