How to reproduce:
  Darwin (Snow Leopard) with python 2.6 and 2.7 (machine 'darwin' at UW)

./waf configure --with-python=/opt/local/bin/python2.7 --enable-examples --enable-tests
./waf

yields:
i686-apple-darwin10-g++-4.2.1: -bundle not allowed with -dynamiclib
Waf: Leaving directory `/private/tmp/ns-commits/tests/tmp/ns-3-allinone/ns-3-dev
/build'
Build failed
 -> task failed (exit status 1):
        {task 4322619920: cxxshlib ns3module.cc.5.o -> config_store.so}
['/usr/bin/g++', '-dynamiclib', '-bundle', '-undefined', 'dynamic_lookup', 'src/
config-store/bindings/ns3module.cc.5.o', '-o', '/private/tmp/ns-commits/tests/tm
p/ns-3-allinone/ns-3-dev/build/bindings/python/ns/config_store.so', '-L.', '-L.'
, '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '
-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.
', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L.', '-L/opt/local/lib', '-L/opt/
local/lib', '-L/opt/local/lib', '-lns3-aodv', '-lns3-dsdv', '-lns3-mesh', '-lns3
-test', '-lns3-csma-layout', '-lns3-point-to-point-layout', '-lns3-netanim', '-l
ns3-olsr', '-lns3-csma', '-lns3-lte', '-lns3-wimax', '-lns3-spectrum', '-lns3-ap
plications', '-lns3-virtual-net-device', '-lns3-uan', '-lns3-energy', '-lns3-flo
w-monitor', '-lns3-nix-vector-routing', '-lns3-visualizer', '-lns3-internet', '-
lns3-bridge', '-lns3-point-to-point', '-lns3-mpi', '-lns3-wifi', '-lns3-propagat
ion', '-lns3-mobility', '-lns3-config-store', '-lns3-tools', '-lns3-stats', '-ln
s3-topology-read', '-lns3-network', '-lns3-core', '-lxml2', '-lpthread', '-lz',
'-liconv', '-lm', '-lsqlite3', '-lpython2.7']


This seems to have been introduced in the past day or two; changeset 7669	ab2af491785a from 30 Dec. does not exhibit the problem.