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<div class="">On 27 Mar 2022, at 00:55, Ryan Schmidt <<a href="mailto:ryandesign@macports.org" class="">ryandesign@macports.org</a>> wrote:</div>
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<div class="">Please direct all mailing list questions to the addresses at <a href="http://lists.macports.org" class="">
lists.macports.org</a>, not the older addresses that were deprecated in late 2016. I've fixed the address in this reply.<br class="">
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On Mar 26, 2022, at 04:54, Epstein, David wrote:<br class="">
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<blockquote type="cite" class="">I am using MacPorts base version 2.7.2 under OS 11.6.4.<br class="">
All my dealings with MacPorts is done using sudo<br class="">
I got the following error:<br class="">
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When doing what?<br class="">
<br class="">
<blockquote type="cite" class="">45 try<br class="">
:<br class="">
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---> 46 _lib = cdll.LoadLibrary('libopenslide.0.dylib')<br class="">
47 except OSError<br class="">
:<br class="">
<br class="">
48 # MacPorts doesn't add itself to the dyld search path, but<br class="">
49 # does add itself to the find_library() search path<br class="">
50 # (DEFAULT_LIBRARY_FALLBACK in ctypes.macholib.dyld) on<br class="">
51 # Python 2.6 and 2.7. Python 3 users on MacPorts should add<br class="">
52 # the MacPorts lib directory to DYLD_LIBRARY_PATH.<br class="">
<br class="">
Q1 Where is DYLD_LIBRARY_PATH defined?<br class="">
Q2 What is the official pathname of the “MacPorts lib directory”?<br class="">
Q3 How should I have found the answers to the above two questions, without<br class="">
bothering macports-users?<br class="">
<br class="">
It would be nice if the standard MacPorts distribution dealt with this<br class="">
problem so that I didn’t have to deal with it manually.<br class="">
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Normally, DYLD_LIBRARY_PATH should not be defined. It should only be set by a build system at very specific times when needed during the build. You should not need to set it after the build is done.<br class="">
<br class="">
Sounds like whatever third-party software you're running here is under the mistaken belief that you should set DYLD_LIBRARY_PATH to some value when running their program. You should ask them to fix their program so that that is not necessary, because setting
DYLD_LIBRARY_PATH other than at the very specific times I mentioned can cause unintended consequences. If they believe they need to set DYLD_LIBRARY_PATH because of some deficiency in MacPorts, they should be discussing that with us so that we can correct
whatever the problem is.<br class="">
<br class="">
If the software you're running was installed by a MacPorts port, we could patch it to fix the problem for them; if so, let us know what port it is.<br class="">
<br class="">
The MacPorts library directory it's referring to would be whatever directory libopenslide.0.dylib is located in, which might be /opt/local/lib.<br class="">
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<div>Thanks for the answers. The maintainer of macports openslide kindly wrote to me, basically to tell me that this is the same problem previously raised by me. (See <a href="https://trac.macports.org/ticket/63492" class="">https://trac.macports.org/ticket/63492</a>).
So, on the one hand, I shouldn’t have needed to write again, but, on the other hand, after the most recent exchange of emails, I now understand much better why I’m getting problems, and should not have to write a third time on the same issue. The error occurred
when I was trying to load openslide, following somewhat complex instructions in a python package about creating a particular virtual environment. The python package instructions told me to “port install openslide”, but failed to say also to“port install py37-openslide”.
I think that the version of py37-openslide in my virtual environment at that time actually came from pypi. So now the error message makes sense to me, which I find reassuring. And it was subsequently easy to modify my virtual enviroment so that everything
now works.</div>
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