#4 LD_LIBRARY_PATH needed on Unix

[Jeremy]

Currently LD_LIBRARY_PATH must be set on Unix for programs to find the compiled shared libraries correctly. This is unacceptable. Boost.Build contains a mechanism to take care of this, but it fails on OS X, and perhaps on other versions of Unix.

TODO:

Ask the Boost.Build list about solutions.
Test the available Boost.Build solution on a few versions of Linux and Unix to see if it only breaks on OS X.