Hey Pierre,
Thanks a lot for the OSX version.
Although I can't seem to make it work over here

I'm on a MacbookPro 10.5.4
Here is the crash log, I hope it makes sense to you

Process: xnview [6753]
Path: /Applications/xnview.app/Contents/MacOS/xnview
Identifier: com.xnview.XnViewQT
Version: ??? (???)
Code Type: X86 (Native)
Parent Process: launchd [123]
Date/Time: 2008-07-04 14:23:54.277 +0200
OS Version: Mac OS X 10.5.4 (9E17)
Report Version: 6
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000
Crashed Thread: 0
Dyld Error Message:
Library not loaded: /usr/local/Trolltech/Qt-4.4.0/lib/QtGui.framework/Versions/4/QtGui
Referenced from: /Applications/xnview.app/Contents/MacOS/xnview
Reason: image not found