Downloaded and extracted the source tarball to my flash drive. When I run ./configure command it fails with the message "Cannot read /media/hpv12. 5w/qt-everywhere-opensource-src-5.4.1: file to open is a directory
Error processing project file: /media/hpv125w/qt-everywhere-opensource-src-5.4.1"
I find using the online installer (package manager) is easier to use that using the tarball. There's just one tick box to select the source code download, and it extracts the source code to the Qt install directory.