super-post-script: In the process of doing this research, IRIX scribbled over my filesystem while I was making a tarfile backup of a directory. I went to SGI's ftp server to see if I could find a recommended/required patchset, but all they had for IRIX 4.0.x was an updated Sendmail (in ftp.sgi.com/patches). Are older patchsets still squirelled away somewhere on the FTP site? (I'm looking for 4.0.5 and 3.3.2)