On Feb 10, 2013, at 23:09, Frank J. R. Hanstick wrote:

> I keep getting the following error when trying to upgrade qt4-mac:
> 
> :info:configure error: The compiler (/usr/bin/g++-4.0) does not seem to 
> support the Objective-C blocks (^), which are used by Qt when compiling on 
> Mac OS X.

A potential fix was committed already but I have not tested it yet. You could 
selfupdate and try again.

https://trac.macports.org/ticket/37994


> Why is qt-mac trying to use /usr/bin/g++-4.0 to build?

Because that is the version of gcc MacPorts uses by default on Leopard (and 
Tiger). We have discussed maybe changing that to gcc-4.2, but that hasn't 
happened yet in a released version of MacPorts.


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