Error Building OgreNewt On OS X

I'm trying to use scons to build OgreNewt on my Mac. I just downloaded and installed scons and tried running it, but I got some errors:

~/Desktop/OgreNewt Folder > scons
scons: Reading SConscript files ...
/bin/sh: line 1: pkg-config: command not found
OSError: 'pkg-config OGRE --cflags --libs' exited 127:
File "/Users/nickgravelyn/Desktop/OgreNewt Folder/SConstruct", line 22:
env.MergeFlags(['!pkg-config OGRE --cflags --libs'])
File "/usr/lib/scons-0.97/SCons/Environment.py", line 662:
args = self.ParseFlags(args)
File "/usr/lib/scons-0.97/SCons/Environment.py", line 651:
do_parse(arg, do_parse)
File "/usr/lib/scons-0.97/SCons/Environment.py", line 532:
for t in arg: me(t, me)
File "/usr/lib/scons-0.97/SCons/Environment.py", line 537:
arg = self.backtick(arg[1:])
File "/usr/lib/scons-0.97/SCons/Environment.py", line 473:
raise OSError("'%s' exited %d" % (command, status))


Any ideas? Anyone else know how to build OgreNewt on OS X?