Writing some simple Qt4 demos depending the book by Daniel Molkentin. In that book, it says you build the release or debug versions of your app with "make release" or "make debug". In real life, these give errors. Only bare naked "make" works. I assume something has changed between the version of Qt4 used in the book and the version I'm using, qt4.6.2.

So what is the proper way to determine whether to make release or debug?

(And why can't google find any updates or errata for this book relating to this?)