If you are trying to debug something like:
  ImportError: No module named ntp
you have come to the right place.

The default location where we install our python libraries is
  /usr/local/lib/pythonX.Y/site-packages/
where X and Y are the python version numbers.

Unfortunately, that's not on the default search path of several
OSes/distros, in particular Fedora and NetBSD.


Python has a search path that is used to find library modules when
you import them.  You can see your search path with:
  python2 -c "import sys; print sys.path"
or
  python3 -c "import sys; print(sys.path)"

Info on Python's search path:
  https://docs.python.org/2/tutorial/modules.html
or
  https://docs.python.org/3/tutorial/modules.html



There are several ways to make things work.

1: You can modify the location where waf will install the libraries.
For NetBSD, something like this should work:
  ./waf configure \
    --pythondir=/usr/pkg/lib/python2.7/site-packages \
    --pythonarchdir=/usr/pkg/lib/python2.7/site-packages \
    ...
You need to specify it at configure time.  Install time is too late.


2: You can setup your PYTHONPATH with something like this:
  export PYTHONPATH=/usr/local/lib/python2.7/site-packages
For bash, you can add that line to your .bashrc or the system /etc/bashrc
If you don't put it in the system file, all users will have to do this,
including root if root uses any ntp scripts.


3: You can add to the default search path by setting up a .pth file
with something like this:
  echo /usr/local/lib/python2.7/site-packages > \
    /usr/lib/python2.7/site-packages/ntpsec.pth
This works for all users, including root.
Note that the pth file must be on the default Python search path.