Getting Started/Build/KDE4

This article shows how to download, build, install and start KDE 4 from subversion. It consolidates howtos from various sites, e.g. the old KDE developer pages. This topic shows one way that works. It does not intend to explain the obvious background behind it.

You may be interested in: http://kdesvn-build.kde.org/

To reduce complexity, we use the bash-shell (standard) throughout the tutorial.

Become the user kde-devel

useradd kde-devel
mkdir /home/kde-devel
passwd kde-devel
chown kde-devel:kde-devel /home/kde-devel 2>/dev/null || \
chown kde-devel:users /home/kde-devel

Switch to the user kde-devel: (the dash also changes to the new home directory)

su - kde-devel

Set Environment Variables

You have to add some environment variables - add these lines to your shell's configuration file, e.g. ~/.bashrc.

export YACC='byacc -d'
export QTDIR=$HOME/qt-unstable
export KDEDIR=$HOME/kde
export KDEDIRS=$KDEDIR
export DBUSDIR=$KDEDIR
export PKG_CONFIG_PATH=$DBUSDIR/lib/pkgconfig:$PKG_CONFIG_PATH
export PATH=$QTDIR/bin:$KDEDIR/bin:$PATH
export LD_LIBRARY_PATH=$QTDIR/lib:$KDEDIR/lib:$LD_LIBRARY_PATH
## Uncomment if dbus doesn't work
#alias dbusstart="eval `PATH=$DBUSDIR/bin \
#$DBUSDIR/bin/dbus-launch --auto-syntax`"
function cmakekde { cmake -DCMAKE_INSTALL_PREFIX=$HOME/kde \
-DCMAKE_BUILD_TYPE=debugfull $@ && make VERBOSE=1 && make install; }

Check out the software

svn co svn://anonsvn.kde.org/home/kde/trunk/qt-copy
svn co svn://anonsvn.kde.org/home/kde/trunk/KDE/kdelibs
wget http://www.cmake.org/files/v2.4/cmake-2.4.3.tar.gz
wget http://dbus.freedesktop.org/releases/dbus/dbus-0.94.tar.gz

Build D-Bus

tar xvfz dbus-0.94.tar.gz
cd dbus-0.94/
./configure --disable-qt --disable-qt3 --prefix=$DBUSDIR \
--localstatedir=/var && make && make install
dbus-uuidgen --ensure

Build Qt

cd ~/qt-copy && ./apply_patches && \
./configure -qt-gif -no-exceptions -debug -fast \
-prefix $QTDIR -qdbus && make && make install

Build and Install CMake

The default prefix is /usr/local, make sure /usr/local/bin is in your $PATH.

cd
tar zxf cmake-2.4.3.tar.gz
mkdir cmake-build
cd cmake-build
../cmake-2.4.3/bootstrap
make
sudo make install

Build kdelibs

cd
mkdir kdelibs-build
cd kdelibs-build
cmakekde ../kdelibs

Troubleshooting

If you have problems compiling this, first make sure the following commands can be executed: aclocal, autoconf, autoheader, gcc, g++, pkg-config.

Tip

If you get "Could NOT find GIF", install the devel package of libungif (the actual name may vary between operating systems).

If the problems persist, try the make-option --keep-going

Build kdepimlibs

Before kdebase you need to install kdepimlibs

cd
svn co svn://anonsvn.kde.org/home/kde/trunk/KDE/kdepimlibs
mkdir kdepimlibs-build
cd kdepimlibs-build
cmakekde ../kdepimlibs

Build kdebase

You may need kdebase for some kioslaves.

cd
svn co svn://anonsvn.kde.org/home/kde/trunk/KDE/kdebase
mkdir kdebase-build
cd kdebase-build
cmakekde ../kdebase

Troubleshooting

If you have troubles compiling this:

• Make sure you have the libxss headers installed. (Usually you got undefined references on xscreensaver objects if you haven't those headers)
• which meinproc has to deliver /home/kde-devel/kde/bin/meinproc
• if cmakekde cannot find the path of kdepimlibs, edit the file /home/kde-devel/kdebase-build/CMakeCache.txt and manually set KDEPIMLIBS_INCLUDE_DIR:PATH=/home/kde-devel/kdepimlibs-build
• if you get an error saying "Please set the following variables: X11_XTest_LIB (ADVANCED)", install the devel package of xtest. On some systems, this is packaged separately from xext and called x11proto-xext-dev. You may also need to remove the CMakeCache.txt file in the build dir after installing the package.

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

Using Xephyr for developing inside KDE 3

Instead of using a full-blown new virtual X for developing software you can use Xephyr to embed your KDE 4 session into your working KDE 3 environment.

Sure you can do this with xnest too, but it cannot handle extensions like Xrender so some people prefer Xephyr over it.

If you want to get a minimal KDE session up and running, just launch Xephyr (available in Kubuntu as xserver-xephyr):

# Xephyr :1&

You can now launch KDE:

export DISPLAY=:1
/path/to/kde4/bin/startkde-modified &

startkde-modified is a copy of the startkde-script which includes the following lines on the top:

export KDEDIRS=`kde4-config --prefix`
export LD_LIBRARY_PATH=$KDEDIR/lib
export PATH=$KDEDIR/bin/:$PATH
export KDEHOME=~/.kde4

You can also use Xephyr with KDM via the Xdmcp protocol and simply a new KDE 4 session to KDM.

On Kubuntu, you can enable it by changing

[Xdmcp]
# Whether KDM should listen to incoming XDMCP requests.
# Default is true
Enable=false

in /etc/kde3/kdm/kdmrc to

[Xdmcp]
# Whether KDM should listen to incoming XDMCP requests.
# Default is true
Enable=true

and adjust your /etc/kde3/kdm/Xaccess to allow your local machine access. Additionally you should make sure to set up a port blocking policy on all external interfaces for the Xdmcp port if you are doing this on a laptop or a PC in an untrusted environment.

If you are done, simply launch Xephyr:

Xephyr -query localhost :1 -host-cursor -screen 1024x768&

where -host-cursor tries to reuse the host's cursor and -screen sets the screen dimensions.

Additional notes:

http://wiki.kde.org/tiki-index.php?page=KDECMakeIntro