Qt Creator Compiler Options
I assume you are using Windows - the installer for Qt typically comes with an included version of GCC, so you can just chose to install it, Qt will use that and automatically do all the configurations.If you are building Qt yourself, make sure you get an up-to-date version of GCC and carefully follow the instructions.Qt employs a MOC - a meta object compiler, which generates lots of boilerplate code to make development easier. Meaning you have to run qmake before you compile the sources.I'd recommend to use Qt's own IDE - Creator - it is available on multiple platforms and is pretty good, tailored around Qt's programming idioms and best of all - will take care of the build process and of its requirements as well. It is most certainly better than the DevC IDE.