ImageMagick @6.9.9-40_1: Requires version of libfftw3.3.dylib not provided by fftw-3

[mforbes (Michael McNeil Forbes)]

After upgrading ImageMagick, trying to make an animated gif from some frames leads to the following error:

$ convert -delay 20.0 -loop 0 _tmp*.png line.gif
dyld: Library not loaded: /opt/local/lib/libfftw3.3.dylib
  Referenced from: /opt/local/bin/convert
  Reason: Incompatible library version: convert requires version 9.0.0 or later, but libfftw3.3.dylib provides version 8.0.0
Abort trap: 6

Not sure why ImageMagick would be depending on an unsupported version of libfftw3.3, but in the meantime, the ImageMagick port should probably drop back to a version that is compatible with the available fftw-3 package or an additional fftw-3 package should be added.

[mforbes (Michael McNeil Forbes)]

After some further testing, it turns out that this was due to an incompatible version of libfftw3 being loaded outside of macports. The error message is confusing since it directly references the MacPorts version of the library, but I don't think there is anything that can be done about this here. Please close.

Workaround: Make sure that no outdated versions of libfftw appear on DYLD_LIBRARY_PATH or LIBRARY_PATH before running convert.

[mf2k (Frank Schima)]

In the future, please add the port maintainer(s) to Cc (port info --maintainers ImageMagick), if any.

[ryandesign (Ryan Carsten Schmidt)]

Users generally should not use DYLD_LIBRARY_PATH because it causes issues like this. :)