Mac fixes for scons build

[alex25]

Okiedokie... committed to svn with my spanking new privs. Let me know if anything goes wrong.

don't know if this is the cause, but 'scons install' doesn't work for me anymore:

Code:

scons: *** [/usr/local/bin/vdrift] Exception
Traceback (most recent call last):
  File "/usr/lib/scons/SCons/Taskmaster.py", line 194, in execute
    self.targets[0].build()
  File "/usr/lib/scons/SCons/Node/__init__.py", line 301, in build
    apply(executor, (self, exitstatfunc), kw)
  File "/usr/lib/scons/SCons/Executor.py", line 129, in __call__
    self.do_execute(target, exitstatfunc, kw)
  File "/usr/lib/scons/SCons/Executor.py", line 122, in do_execute
    kw)
  File "/usr/lib/scons/SCons/Action.py", line 313, in __call__
    s = self.strfunction(target, source, env)
  File "/usr/lib/scons/SCons/Environment.py", line 87, in installString
    return s(target[0].path, source[0].path, env)
AttributeError: Alias instance has no attribute 'path'
scons: building terminated because of errors.

--alex--