If you are on the Windows platform and used MinGW to compile Qt, you need to tell Qt Creator where MinGW is installed. This is done by setting the MinGW directory.

If you are using Qt for Symbian and your S60 SDK is registered with devices.exe, Qt Creator detects the Qt version automatically. It is shown in the Auto-detected section in the options dialog. You can also manually add Qt for Symbian versions. In this case you need to tell Qt Creator the path to the S60 SDK it is supposed to use with these Qt installations. Add the path to your Carbide C++ install, version 2.0 or later, if you want to build for the emulator (WINSCW tool chain). If you want to use GCCE to build for your device, you might need to add the path to the CSL ARM Toolchain directory (CSL/GCCE Directory), if the compiler is not found in the PATH environment variable.