[Development] configure failure on Mac

[Glen Mabey]

I'm on the dev branch but experienced this issue before the 5.2 and 5.3 branches split.

macbookpro:qtbase$ ./configure -prefix ~/src/take2/install

<snip>

Running configuration tests...
The test for linking against libxcb and support libraries failed!
You might need to install dependency packages, or pass -qt-xcb.
See src/plugins/platforms/xcb/README.


Which seems to me like it's performing X11 checks on the wrong platform.

I can file a bug if I'm really not missing something obvious …

Thanks,
Glen