security/py-xmlsec has several problems:
1) on build - had to add: CONFIGURE_ARGS+= --with-nss=/usr/local --with-nspr=/usr/local to make it build.
2) on first attempt to import with python:
Not known. Please consult maintainer (email@example.com)
How-To-Repeat: See full description.
I'll try to solve this problem.
I do not understand why adding such CONFIGURE_ARGS is needed as this port
builds successfully without it. About problem with importing undefined symbol:
you should update your libxml2 library (textproc/libxml2).
Python related part has been committed.