I apologize if I've already sent this in. I don't recall see the message at all. While configuring 21.2.26 on NT with cygwin, the autodetect of sound fails to detect NAS, which I have installed and working on NT. (It worked with version beta 23, the last version I build on NT.) The problem is when configure tries to find AuOpenServer, it fails to link with -lXau to get an authorization routine. To get past this point, I had to add it to the list of libraries to link with. Unfortunately, I don't know enough about configure to know how to fix this. This problem also shows up later when trying to make xemacs. Linking temacs fails for the same reason we couldn't detect AuOpenServer: the link needs to include the libXau library. I suppose this might be a problem of the X11 libraries I have. These are the ones that Andy made for cygwin 19.1 a very long time ago. Ray