[tlbuild] Building on Mac

[Nelson H. F. Beebe]

On Mac OS X systems, "uname -a" gives the kernel version, but
not the OS version.  Here is how to get it:

%  sw_vers
ProductName:    Mac OS X Server
ProductVersion: 10.5.8
BuildVersion:   9L30

% uname -a
Darwin XXXXXX.math.utah.edu 9.8.0 Darwin Kernel Version 9.8.0: Wed Jul 15
16:55:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_I386 i386 i386 Xserve1,1
Darwin

To get an extremely detailed description of the system:

% system_profiler -detailLevel -1
Hardware:

    Hardware Overview:

      Model Name: Xserve
      Model Identifier: Xserve1,1
      Processor Name: Dual-Core Intel Xeon
      Processor Speed: 2 GHz
      Number Of Processors: 2
      Total Number Of Cores: 4
      L2 Cache (per processor): 4 MB
      Memory: 4 GB
      Bus Speed: 1.33 GHz
      Boot ROM Version: XS11.0080.B01
      SMC Version (system): 1.11f5
      LOM Revision: 1.2.8

... 350 more lines ...

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- Nelson H. F. Beebe                    Tel: +1 801 581 5254                  -
- University of Utah                    FAX: +1 801 581 4148                  -
- Department of Mathematics, 110 LCB    Internet e-mail: beebe at math.utah.edu  -
- 155 S 1400 E RM 233                       beebe at acm.org  beebe at computer.org -
- Salt Lake City, UT 84112-0090, USA    URL: http://www.math.utah.edu/~beebe/ -
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