qt4-mac runtime dyld symbol not found error

[fleischer@…]

On Mac OS 10.7.3, qt4-mac installs properly but crashes at runtime.

MY PATH includes /opt/local/bin and DYLD_LIBRARY_PATH includes /opt/local/lib which I assume should cover all the bases

$ sudo port selfupdate
--->  Updating MacPorts base sources using rsync
MacPorts base version 2.0.4 installed,
MacPorts base version 2.0.4 downloaded.
--->  Updating the ports tree
--->  MacPorts base is already the latest version

The ports tree has been updated. To upgrade your installed ports, you should run
  port upgrade outdated

$ sudo port install qt4-mac
--->  Computing dependencies for qt4-mac
--->  Fetching archive for qt4-mac
--->  Attempting to fetch qt4-mac-4.7.4_1+quartz.darwin_11.x86_64.tbz2 from http://packages.macports.org/qt4-mac
--->  Attempting to fetch qt4-mac-4.7.4_1+quartz.darwin_11.x86_64.tbz2.rmd160 from http://packages.macports.org/qt4-mac
--->  Installing qt4-mac @4.7.4_1+quartz
--->  Activating qt4-mac @4.7.4_1+quartz
--->  Cleaning qt4-mac


$ qmake --version
dyld: Symbol not found: __cg_jpeg_resync_to_restart
  Referenced from: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/ImageIO
  Expected in: /opt/local/lib/libJPEG.dylib
 in /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/ImageIO
Trace/BPT trap: 5

[ryandesign (Ryan Carsten Schmidt)]

Please unset DYLD_LIBRARY_PATH; having it set causes problems.