bug#27736: OSX 10.6.8: Building from master branch fails.

[Keith David Bershatsky]

Just plain old "10.6.8" is returned:

(shell-command-to-string "sw_vers -productVersion"):  "10.6.8"

Here is a copy of the System Profiler / System Software Overview:

  System Version:  Mac OS X Server 10.6.8 (10K549)
  Server Configuration:  Advanced
  Kernel Version:  Darwin 10.8.0
  Boot Volume:  SERVER
  Boot Mode:  Normal
  Computer Name:  server
  User Name:  lawlist (HOME)
  Secure Virtual Memory:  Not Enabled
  64-bit Kernel and Extensions:  Yes
  Time since boot:  3:28

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DATE:  [11-05-2017 10:15:45] <05 Nov 2017 13:15:45 -0500>
FROM:  Noam Postavsky <npostavs@users.sourceforge.net>
> 
> * * *
> 
> Based on the fix which is posted here:
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=27706#25
> 
> I think the output of
> 
>     (shell-command-to-string "sw_vers -productVersion")
> 
> on your machine would be of interest.