emerge gentoo-sources fails FINISHED

 >emerge of 3.7.10 succeeded,  currently attempting a genkernel  build.

That was Saturday afternoon.  I tried again after reading that.  This 
time, emerge did not give a fatal error.  I tried make menuconfig and 
failed.  There was no /usr/src/linux/Makefile.  Furthermore, there were 
_no_ files in /usr/src/linux, just directories.
So, I did a tar tvJf linux-3.7.tar.xz | less
in /usr/portage/distfiles.  Files were there.  I speculated that the 
patching process was butchering something.  Doesn't matter.

I waited until later, past midnight UTC.  I said some incantations, made 
some magic gestures, prayed, ran emerge, and went to sleep.
This time it worked.  I built a kernel and rebooted.  Hooray.  This 
thread can end with success.

Adios,  DW