Thank you for the patch; that allows the build to finish.  The remaining
issues are now:

msg72029: printf("%ls",...) bug
msg72044: does not build with db4.7

Finally proceeding to the install, now I get another error:

mkdir ./Lib/plat-cygwin
cp ./Lib/plat-generic/regen ./Lib/plat-cygwin/regen
export PATH; PATH="`pwd`:$PATH"; \
	export PYTHONPATH; PYTHONPATH="`pwd`/Lib"; \
	export DYLD_FRAMEWORK_PATH; DYLD_FRAMEWORK_PATH="`pwd`"; \
	export EXE; EXE=".exe"; \
	cd ./Lib/plat-cygwin; ./regen
python$EXE ../../Tools/scripts/h2py.py -i '(u_long)'
/usr/include/netinet/in.h
Could not find platform independent libraries <prefix>
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
Fatal Python error: Py_Initialize: can't initialize sys standard streams
ImportError: No module named encodings.utf_8
./regen: line 3:  4164 Segmentation fault      (core dumped) python$EXE
../../Tools/scripts/h2py.py -i '(u_long)' /usr/include/netinet/in.h
make: *** [Lib/plat-cygwin] Error 139