Before you build the Qt library and example programs, you must run the "configure" script to set the platform information and other build settings. You can use the -platform option to specify the operating system and compiler you are using. Supported platforms and compilers: aix-g++ hpux-g++ linux-g++ solaris-cc-64 win32-g++ aix-xlc hpux-g++-64 linux-g++-64 solaris-g++ win32-icc aix-xlc-64 irix-cc linux-icc solaris-g++-64 win32-msvc freebsd-g++ irix-cc-64 macx-g++ tru64-cxx win32-msvc.net freebsd-icc irix-g++ macx-pbuilder tru64-g++ hpux-acc linux-ecc-64 solaris-cc win32-borland Compilation problems: If you experience problems compiling Qt 3.x consult the platform notes found at http://www.trolltech.com/developer/platforms/ where we post workarounds and known issues as we become aware of them. Example: ./configure -platform irix-cc-64 -shared -debug Customization: You can create your own custom configuration by adding new files to the mkspecs directory. Use existing similar configurations as a starting point.