[hughsie@hughsie-laptop gnome]$ ./waf.py install
* installing /home/hughsie/user/code/waf/demos/gnome/pixmaps/gnome-hello-logo.png as /home/hughsie/.root/share/icons/hicolor/48x48/apps/gnome-hello-logo.png

Build finished successfully
* installing /home/hughsie/user/code/waf/demos/gnome/_build_/default/src/gnome-hello as /home/hughsie/.root/bin/gnome-hello
Traceback (most recent call last):
  File "./waf.py", line 149, in ?
    Main()
  File "/home/hughsie/user/code/waf/demos/gnome/wafadmin/Scripting.py", line 180, in Main
    bld.install()
  File "/home/hughsie/user/code/waf/demos/gnome/wafadmin/Build.py", line 193, in install
    for obj in Object.g_allobjs: obj.install()
  File "/home/hughsie/user/code/waf/demos/gnome/wafadmin/Tools/gnome.py", line 29, in install
    current = Params.g_build.m_curdirnode
NameError: global name 'Params' is not defined