openjpeg: Library not loaded: /opt/local/lib/libpng12.0.dylib

[andrew.c.stewart@…]

Thought an error I was getting with javacv was a javacv problem but I tried to do a simple

#include <opencv2/core/core.hpp>

I got a very similar error to the one I got with javacv... something about 'image not found'.

dyld: Library not loaded: /opt/local/lib/libpng12.0.dylib
  Referenced from: /opt/local/lib/libopenjpeg.1.dylib
  Reason: image not found

Any idea what this is about?

[ryandesign (Ryan Carsten Schmidt)]

libpng was upgraded from 1.2.x to 1.4.x a long time ago, and all ports that use libpng should already have been upgraded to newer versions or revisions thus forcing them to rebuild. Specifically, libpng was updated to 1.4.x in January in r75159, and openjpeg was updated to 1.4 in April in r77941 thus rebuilding against the new libpng.

But apparently on your system your openjpeg port has not been rebuilt since libpng was updated. I don't know how that's possible, unless you just haven't been updating your ports. So first, please selfupdate and upgrade all outdated ports.

sudo port selfupdate
sudo port upgrade outdated

If the problem persists, force openjpeg to rebuild:

sudo port -n upgrade --force openjpeg

This is described in wiki:ProblemHotlist#libpng

[jmroot (Joshua Root)]

This should be fixed by rev-upgrade now if it wasn't fixed before.