vos-s5.3

Attached is a patch that

1. adds a file called BUILD.txt that starts to give some instructions on 
how to build vos, including a list of dependencies you can install if 
you don'nt want the scons script to try downloading and building stuff.

2. links to libpthread when testing crypto++

vostest runs successfully for me.  Pete, can you describe what the other 
programs you've started are for and how to run them?

Reed

=== added file 'BUILD.txt'
--- BUILD.txt	1970-01-01 00:00:00 +0000
+++ BUILD.txt	2009-02-17 18:13:01 +0000
@@ -0,0 +1,92 @@
+
+
+Building VOS
+============
+
+To build VOS, run the scons.py script:
+
+ ./scons.py
+
+or