devel/boost-python should include the utility pyste. Documentation for this is included, but the utility is not installed.
Go to the directory : ports/devel/boost-python/work/boost_1_32_0/libs/python/pyste
and install as normal for a python script.
Note that this depends on devel/gccxml and elementtree (I didn't find this in ports, but it should be easy to install, see the README file in that directory), dependencies might need to be adjusted.
How-To-Repeat: install devel/boost-python
note that pyste.py is not installed anywhere - should be in /usr/local/bin
Over to maintainer
Sent a patch to the originator, asking him to test it because
I do not use pyste.
Support for pyste has been added, thanks for your hint!