I configured Qt with the following options on OS X:
and then did a make followed by make install. The file qconfig.h was not installed, but qglobal.h includes it. So I can't compile my project with this Qt build unless I copy qconfig.h.
On a side note: the Qt binary packages contain many more (private) header files in its include directory than I get with a make install. Why does make install not result in the same as a binary package? (In our project we have to access a couple of private headers for a few featrures.)