Error while compiling Qt 4.7.1 in Debian Ubuntu (solved)

Did you get this error?:

You might need to modify the include and library search paths by editing  QMAKE_INCDIR_X11 and QMAKE_LIBDIR_X11

Just do this:

sudo apt-get install libx11-dev libfreetype6-dev libavahi-gobject-dev libSM-dev libXrender-dev libfontconfig-dev libXext-dev