Why does Macports reinstall already available software?

[Jakob van Bethlehem]

Dear users,

As a brand new user of macports I may oversee some obvious places to look
for answers, if so, my apologies - I'm always happy with a reference to the
appropriate documentation documents. But sofar I have been unable to figure
out an answer to the following scenario:
- I have a system that has already some package installed, e.g. subversion
1.7.6 (same happened for Python 2.x series) in /usr/local/
- Next I try to install a macport of some package that has these software
suites as a dependency (in this case eric4, or bluefish for the Python-case)
- Macports installs a brand new version of those dependencies in
/opt/local.... why?

Short of the unneeded use of hd-space, this gives me enormous headaches in
setting my PATH correctly, and afaics for no reason. So, what's what I
can't see (yet) ?

Sincerely,
Jakob van Bethlehem
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