Setting up cross compiling environment & Qt/X11 ... - Bytemark Hosting

Qt/embedded which doesn't need a X server which makes systems very lightweight and fast. In this
document we will discuss how to set up Qt using the X server but compiling it for embedded use is
not a big difference.
6.1 Setting up Qt/X11
You first need to set up the terminal compilation method described above. Download the Qt sources
from http://qt.nokia.com/downloads. Scroll a bit down to "Qt libraries". The file should have a
name like qt-everywhere-opensource-src-4.8.2.tar.gz. Extract the sources into you home directory:
$ tar xzf Downloads/qt­everywhere­opensource­src­4.8.2.tar.gz
Change into the Qt directory:
$ cd qt­everywhere­opensource­src­4.8.2
Copy the modified configuration for Qt and replace the existing one. You will find the modified file
in the Anders DX4 wiki:
$ cp ../Downloads/qmake.conf mkspecs/qws/linux­arm­gnueabi­g++/qmake.conf
Then open the file in mkspecs/qws/linux-arm-gnueabi-g++/qmake.conf and make sure that all the
paths to the ELDK are correct.
Make sure all required tools like make are installed:
$ sudo apt­get install build­essential
After that use the following command line to configure Qt. The path behind -prefix defines the
folder where Qt will be installed. This is the folder for the local computer and the DX4. You should
not install it in / because this will cause problems with a local x86 installation of Qt. Execute the
following command to configure the Qt sources (hit return after each line):
./configure ­arch arm ­xplatform qws/linux­arm­gnueabi­g++ \
­force­pkg­config ­nomake demos ­nomake examples ­no­openssl \
­no­sql­sqlite ­no­phonon ­no­phonon­backend ­no­webkit \
­prefix /usr/local/Trolltech/Qt­arm­X11 \
­D QT_RX71_MULTITOUCH ­confirm­license
When the script finishes without any error continue compiling Qt:
$ make ­j X
Where X is the number of cores your CPU has plus one. So type
$ make ­j 5
on a quad core machine. This will speed up things by using parallel compilation.
Note: Depending on the speed of your computer this process can take several hours.
To install Qt on your local machine (which is required to cross compile) just type
$ sudo make install
Now you should add /usr/local/Trolltech/Qt-arm-X11/bin to your PATH variable by adding the
following line to your users .profile file:
export PATH=/usr/local/Trolltech/Qt­arm­X11/bin/:$PATH
To open the file type:
$ gedit ~/.profile
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