On 11/06/2020 17:41, Marco Atzeri via Cygwin-apps wrote: > the 32bit has less memory space so it take a bit of file swapping when > the data are large Ah okay. > run demo in build dir ? > > 1) remove any excessive libraries from your cygwin 32 bit install. > Recently for a similar reason I removed all libboost except the > last one, a good of previous version like libicuXX and similar > that accumulated in the years. > > 2) rebase the built dll's without storing permanently the addresses. >   Attached the script I am using for the scope > > Turns out just running "rebaseall" worked for me. I don't get any fork-related warnings/errors any more. I'm running the demo from https://extras.wxpython.org/wxPython4/extras/4.0.7.post2/ in a separate directory with the packages I built installed. Do I need to rebuild this for the new Python release? If not I think this is all working now. Does it seem good to you? Hamish