I searched once more the reason of this. There is a two version of acme win program, one works fine, and the other does not. The first is that one before I fetched many patches and recompiled; ls -l /n/dump/2002/0723/acme/bin/386/win --rwxrwxr-x M 9 sys sys 174975 Apr 2 01:42 /n/dump/2002/0723/acme/bin/386/win and the second is that after I recomplied: ls -l /acme/bin/386/win --rwxrwxr-x M 9 sys sys 175343 Jul 24 16:48 /acme/bin/386/win As there is no difference between these sources, I suppose this reflect the difference between the lower libraries, probably libc (?). Kenji