Installing Qt on X11 Platforms

Note: Qt for X11 has some requirements that are given in more detail in the Qt for X11 Requirements document.

If you have the commercial edition of Qt, install your license file as $HOME/.qt-license.
For the open source version you do not need a license file.
Unpack the archive if you have not done so already. For example, if you have the qt-x11-opensource-desktop-4.4.3.tar.gz package, type the following commands at a command line prompt:
```
 cd /tmp
 gunzip qt-x11-opensource-desktop-4.4.3.tar.gz        # uncompress the archive
 tar xvf qt-x11-opensource-desktop-4.4.3.tar          # unpack it
```
This creates the directory /tmp/qt-x11-opensource-desktop-4.4.3 containing the files from the archive. We only support the GNU version of the tar archiving utility. Note that on some systems it is called gtar.
Building
To configure the Qt library for your machine type, run the ./configure script in the package directory.

By default, Qt is configured for installation in the /usr/local/Trolltech/Qt-4.4.3 directory, but this can be changed by using the -prefix option. Alternatively, the -prefix-install option can be used to specify a "local" installation within the source directory.
```
 cd /tmp/qt-x11-opensource-desktop-4.4.3
 ./configure
```
Type ./configure -help to get a list of all available options.

To create the library and compile all the demos, examples, tools, and tutorials, type:
```
 make
```
If you did not configure Qt using the -prefix-install option, you need to install the library, demos, examples, tools, and tutorials in the appropriate place. To do this, type:
```
 su -c "make install"
```
and enter the root password.

Note that on some systems the make utility is named differently, e.g. gmake. The configure script tells you which make utility to use.

Note: If you later need to reconfigure and rebuild Qt from the same location, ensure that all traces of the previous configuration are removed by entering the build directory and typing make confclean before running configure again.
Environment variables
In order to use Qt, some environment variables needs to be extended.
```
 PATH               - to locate qmake, moc and other Qt tools
```
This is done like this:

In .profile (if your shell is bash, ksh, zsh or sh), add the following lines:
```
 PATH=/usr/local/Trolltech/Qt-4.4.3/bin:$PATH
 export PATH
```
In .login (in case your shell is csh or tcsh), add the following line:
```
 setenv PATH /usr/local/Trolltech/Qt-4.4.3/bin:$PATH
```
If you use a different shell, please modify your environment variables accordingly.

For compilers that do not support rpath you must also extended the LD_LIBRARY_PATH environment variable to include /usr/local/Trolltech/Qt-4.4.3/lib. On Linux with GCC this step is not needed.
That's all. Qt is now installed.
If you are new to Qt, we suggest that you take a look at the demos and examples to see Qt in action. Run the Qt Examples and Demos either by typing qtdemo on the command line or through the desktop's Start menu.

You might also want to try the following links:

We hope you will enjoy using Qt. Good luck!

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