Dyld Error Message on new DS download

Hi, I'm getting the following error message having just re-downloaded Draftsight for registration purposes:

Dyld Error Message:

Library not loaded: /usr/lib/libc++.1.dylib

Referenced from: /Volumes/DraftSight/DraftSight.app/Contents/MacOS/../Frameworks/QtWebKitWidgets

Reason: image not found

 

I'm using Mac osx 1.6.8. I've tried an extensive online search to no avail as of yet. Can anybody help me with this?

 

Thanks

Féidhlim