Install QT4 from source on Ubuntu 10.04

If you install QT4 from source encounter the error following:

Basic XLib functionality test failed!
 You might need to modify the include and library search paths by editing
 QMAKE_INCDIR_X11 and QMAKE_LIBDIR_X11 in /home/miles/qt-everywhere-opensource-src-4.6.3/mkspecs/linux-g++.



To resolve this problem by install libxext-dev:

sudo apt-get install libxext-dev -y

Refer:
http://ubuntuforums.org/showthread.php?t=1183470