emerge is a tool to build the KDE sources and its third-party requirements on MS Windows. It is the easy way to build KDE on MS Windows.
Emerge is a tool that can build the different parts of KDE and its dependencies under Windows. We created this tool to automate and simplify the build process under Windows. We try to build all packages that we offer in the KDE installer with emerge. That has some advantages for us:
Before emerge it was quite some work to set a system up for development. There were some quirks, which were documented in some mailing lists, but you had to remember them or you ran into an already solved problem again, etc. Now to get a development machine you need a Windows computer, need to install Python and Subversion and do the emerge checkout. Then execute emerge to build what you want to build. This is easy for developers coming from Windows to KDE, and also for KDE developers coming to Windows.
With emerge you can build the whole software stack (low-level libs, Qt, kdelibs, things above that) with only one command. You can start that build, and some hours later you can check if it worked, or if something broke. So we can spot problems easier and earlier. We can also start with a "naked" Windows computer without any other installed software and bootstrap kde on it. That ensures, that no hidden dependencies on some pieces of software sneak in, because then the builds on a "naked" computer would break and show the problem.
We can test the same emerge build description for a package on different Windows versions/computers before we do binary releases. People can also add build descriptions for new packages to the Subversion repository.
This emerge tool was inspired by the Gentoo emerge tool.
Create a directory if possible in your harddrive's root e.g. C:\kderoot or D:\kderoot (You will need this PATH later). This directory will contain the whole kde installation later. We will refer to it as %KDEROOT%.
emerge.bat invokes an emerge.py script written in Python programming language, so you first need to install the Python 2.7 Interpreter. The python installation directory will be added to the PATH later by %KDEROOT%\etc\kdesettings.bat script.
The latest source code for Windows emerge and the rest of KDE is stored in a repository created and managed using the Subversion version control tool, abbreviated svn. You need a Subversion client for the first checkout of emerge. There are at least two applications:
Emerge uses its own Subversion client for checking out all KDE source code. However it is not quite up to date: From August 2009. You can find it in %KDEROOT%\dev-utils\svn\bin. It will be used by emerge even if you have another svn executable installed.
Note 1: If you experience problems with the checkout of Qt (svn doesn't work correctly) please remove any other svn binaries out of the path that you do have. The different versions of the Apache portable runtime (APR) are incompatible!
Note 2: Most source files in the KDE Subversion repository have Unix line endings, and svn will not convert them to Windows line endings. This is fine for emerge, but the standard Windows editor might not show those files correctly. You can use another editor like vim (http://www.vim.org).
The source code of the emerge tool and the recipes for creating KDE packages are located at svn://anonsvn.kde.org/home/kde/trunk/kdesupport/emerge, which is an URL based on the Subversion-specific svn protocol.
You need to check out the source code from the emerge Subversion directory into a new directory below your root directory (the root directory is normally called %KDEROOT% here) or get it inside a self extracting archive (not tested yet).
svn co svn://anonsvn.kde.org/home/kde/trunk/kdesupport/emerge
svn co --username yourusername https://svn.kde.org/home/kde/trunk/kdesupport/emerge
svn co svn+ssh://svn.kde.org/home/kde/trunk/kdesupport/emerge
This would result with:
Error validating server certificate for 'https://svn.kde.org:443': - The certificate is not issued by a trusted authority. Use the fingerprint to validate the certificate manually! Certificate information: - Hostname: svn.kde.org - Valid: from Wed, 11 May 2005 09:08:21 GMT until Sat, 09 May 2015 09:08:21 GMT - Issuer: SVN, KDE e.V., Nuernberg, Bavaria, DE - Fingerprint: xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx (R)eject, accept (t)emporarily or accept (p)ermanently?
enter p here to permanently accept the certificate:
Authentication realm: <https://svn.kde.org:443> KDE SVN account Password for 'yourusername': *************** A emerge\kdeenv.bat A emerge\portage A emerge\portage\kdesupport [....]
The password and cache for the certificates is saved in %APPDATA%\Subversion\auth directory.
After the checkout you should have the directory %KDEROOT%\emerge. If you don't, you move your emerge directory to that location.
The kdesettings.bat script will be called by the main kdeenv.bat script.
Note 1: Be sure that you neither have the msys/bin nor the cygwin/bin in your path. If so you have to definitely remove it from the path.
Note 2 from a user: The applications gimp, inkscape and graphviz are also a problem. To make sure that there's nothing wrong I stripped my path to contain only what I needed to build.
Note 3 from another user: be careful when renaming the file to "kdesettings.bat" it is easy to end up with "kdesettings.bat.bat" instead of what you want since Windows(by default) will not show the the file extension part of a file.
Add a file emergehosts.conf in the %KDEROOT%\etc directory. The format of this file is a typical config file with only two entries per section: The first entry is the host as mentioned in the portage file for the package. The second entry is called replace and is the replace string for the host string.
As an example, here is how to checkout all gitorious based repos of the kde-developers group using a push url instead of the anonymous access:
The name of the section doesn't matter and can be used for descriptions.
To use emerge you need to start a console window and point that to %KDEROOT%\emerge. For example:
C: cd \%KDEROOT%\emerge
Then you have to execute
This tells emerge about your environment settings (e.g. paths). It will load your configuration from %KDEROOT%\etc\kdesettings.bat. It should not give any error messages, otherwise emerge will not work as expected. The output should look similar to this one (of course with your paths):
C:\kderoot\emerge>kdeenv.bat kdesettings.bat executed KDEROOT : C:\kderoot KDECOMPILER : mingw KDESVNDIR : C:\kderoot\svn PYTHONPATH : C:\python27 DOWNLOADDIR : C:\kderoot\download
Next, if you have configured your kdesettings.bat to use svn+ssh for your subversion checkout, then you need to run:
This will prompt you to accept the fingerprint of the server, otherwise svn will hang forever when trying to download from the server.
Now you should be able to use emerge. Type
to get some help on usage.
Note: There is a short path option in kdesettings which you will need if you want to build Qt in a directory that has a pathlenght of more then around 5 characters. This problem is due to limitations of the command line length and the Qt build system.
Currently emerge supports both the MinGW and MS Visual C++ (msvc) compilers. We did not add dependencies for the compilers, so you have to make sure to install a compiler by yourself. There are three ways to set up a compiler for emerge. We assumed you have set KDECOMPILER variable properly in the %KDEROOT%\etc\kdesettings.bat.
In the following sections you can find information on how to install or reuse an existing compiler.
Let emerge install the MinGW compiler, as soon as emerge needs MinGW it will automatically fetch the correct version for you.
You need to point emerge to an existing msvc installation. This is run automatically for you from kdeenv.bat if configured properly in kdesettings.bat. Check your kdesettings.bat file to know where to set it.
Once you have emerge and a compiler installed and working, try:
Further options are described below.
You are now ready to start building KDE, it is recommended to do so progressively, relying on emerge to automatically resolve the required dependencies at each set step:
You will now have successfully installed a base KDE system and can now install other KDE modules as required.
Note that this will install the trunk version of KDE, if you wish to install a particular stable branch then you must prefix the KDE package names with the required version, i.e. emerge kde-4.5/kdelibs. You can force emerge to always default to a given branch by setting the EMERGE_DEFAULTCATEGORY variable in your kdesettings.bat file. You should not mix kde packages from different branches.
It is strongly recommended you do not choose to manually install any of the utilities and libraries yourself, as you may install the wrong version and cause installation failures. Instead allow emerge to resolve the dependencies for you.
Every time you want to update or install a package, you should first update your emerge checkout (simply run emerge --update emerge) to ensure you are using the latest package recipies.
emerge packageName performs the separate actions --fetch, --unpack, --compile, --install, --manifest, and --qmerge.
The --fetch action will retrieve either a binary or the source code for the package:
There are some options that can be used when building with emerge.
|Command line switch||Command line argument||Description|
|-v||EMERGE_VERBOSE||This option sets the verbosity level. Currently the highest verbosity level is 3 (-v -v -v). A verbosity level of 0 should give no output and equals to -q. You can set EMERGE_VERBOSE=3 instead in the environment of the commandline or within your kdesettings.bat file.|
|--offline||This option suppresses the update step of the local tree - which needs some time. Be aware though that you have to have existing sources already if you want to use this option.|
|-t||EMERGE_BUILDTESTS||This option enables or disables KDE4 buildtests for KDE modules. Other packages will not change. Use EMERGE_BUILDTESTS=True or =False.|
|--print-targets||This option will display all "targets" a certain package has. Normally targets are fixed releases or different branches. They are defined in the portage file.|
|--target=TARGET||This sets a specific target for this package. If not added, the default target is used, which can be checked by looking at the output of --print-targets.|
|-i||This option ignores that a package is already installed. It builds it completely new, but keeps the dependencies.|
|--update||This option ignores that a package is already installed but doesn't cleanup an already existing build directory. Thus you will only rebuild files that have changed since the last build.|
emerge --update packagenameto update packagename from the Subversion and compile it without removing the build dir or
emerge --update-allto update all packages that can be rebuild (they are rebuild with --update).
For Fine Tuning see here: Fine-tuning
emerge can mostly cooperate with the kdewin-installer but we're currently still working on some packages which are packaged in a wrong way. It is not recommended to use another layout then installer for directory_layout in the kdesettings.bat anymore (see that file for more detailed information).
emerge creates lots of files in \kderoot\tmp during build. After a package is successfully installed (check \kderoot\etc\portage\installed or the directory \kderoot\manifest\), you can delete its temporary directory.
Windows emerge is derived from the Gentoo portage system, but we are currently not enforcing compatibility. If you have questions about that please contact us at the channel #kde-windows on irc.freenode.net.
last reviewed by SaroEngels 22:25, 4 November 2010 (UTC)