I'm building the development version.  Since I didn't want to lose my work in 
case I had to backtrack (slight RTFM problem, you know) I backed up my build 
environment at chapters 5.34 and 6.61.  I ran into boot problems when 
finished, so I backed up again at that point, deleted the working file set, 
and tried to unzip the 6.61 saved set to step back through and see what I did 
wrong.

 Yes, I failed verify the backup sets, and I deleted the existing fileset.  
Yes, even though there was plenty of room on the disk.  And, of course, the 
backups are unrecoverable.

 The problem is that I used the "zip" program since I didn't want to look up 
the switches to use one of the native Unix utilities. (tar -xvf is almost a 
reflex action, but I almost never have to *create* a compressed file)  The 
Info-Zip code goes all the way back to DOS like I do, so I know the command 
line switches by heart.  I reached for a familiar tool, but it was the wrong 
one - while it will happily make a zip file of any size, it can only unzip a 
file of 2Gb on a 32-bit system or 4Gb on a 64-bit system.  My backup zipfiles 
are 4.3 to 4.6 Gb.  (VMware directories)

 So I've lost the host environment, downloaded source files, and all.

 Y'all can point and hoot at my lapse of good practice, and I'll get back to 
work...
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