Comment 5 for bug 267053

Recent prerelease packages for OS X include newer versions of several libraries, fixing the problem with the conflicting libpng versions.

Bug #392693 tracks the underlying issue: quoting Michael Wybrow
"This is an unfortunate consequence of using DYLD_LIBRARY_PATH, when Apple's system libraries have dependencies on libraries that might also be provided by Macports and bundled with Inkscape.

The right way to fix this is to further investigate and fix the problems with rewriting the install-names for all the libraries bundled with Inkscape, so that DYLD_LIBRARY_PATH is not required."