KDE3To4

How to build KDE 4

Build instructions

for build instructions of KDE 4, please see
http://techbase.kde.org/Getting_Started/Build/KDE4 external link

Start KDE 4 programs

To start the desktop environment itself, do:

X :1 &
export DISPLAY=:1
startkde

Maybe you are logged in as your normal user (not kde-devel), want to stay in your current environment (KDE 3.5, gnome, whatever) and start a KDE 4 program. To start only kwrite from KDE 4, do:

ssh -X kde-devel@localhost
kwrite

Compile your module

Now, we want to start compiling our module, e.g. kdepim. First, make sure the program qt3to4 has run over your code. Then, use the cool scripts from Laurent:

svn co svn://anonsvn.kde.org/home/kde/trunk/KDE/kdesdk/scripts/qt4/

Then, you may run into the following problems:

VerticalAlignment is now part of QTextCharFormat.
kextsocket.h no longer exists. It should be replaced by kstreamsocket (for non-buffered mode) / kbufferedsocket (for buffered mode) / kserversocket (for passive mode).
- The function setBlockingMode has to be replace by setBlocking
there is no longer a QCString, but a QByteArray delivered. For a more detailed explanation, read http://doc.trolltech.com/4.0/porting4.html. You need to convert the QByteArray to a char with the member data(). Example:
one example comparison from websvn.kde.org
reference from Trolltech
WFlags are now Qt::WFlags