When we are building Qt from sources on Mac OS, we are following this instruction:
It worked fine on previous versions of Mac but on Yosemite there is a change related to environment variables. It is not related to Qt actually, just these variables are not visible to GUI applications in Yosemite. See the links below, for example:
This is why Qt Creator doesn't have access to PATH variable. We need to add Qt version in it manually, make sure you will use Command-Shift-G in Finder while selecting path to qmake, for example, our path to qmake is
and Finder doesn't see it by default.