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Is qalculate still being maintained?
Author seems to be no longer registered on Sourceforge.
I created a Qalculate for Macports. It is not yet commited for distribution, but you can find it here:
I also tried contacting the currently listed admin of the project to see if some progress can be made resolving all the patches required to make it work!
If I am correct, a Qt4 version would work on Mac OS X. Push for Qt4!