X.Org User FAQ

If you have problems getting X to start please make sure you have configured your X using one of the available configuration tools. If you are uncertain you did please check the ConfigurationHelp before you read any further.
You can find driver related information in the KnowledgeBase.
If you are using a version of X.Org shipped by a distribution you should check there DistroFAQList, too, before you report an error.
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X server information is usually logged in /var/log/Xorg.0.log, which can be consulted for errors or warnings if the server does not function as expected.
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FAQ

How to clone and build Xorg

See Peter's instructions at: Quickstart for those that do not use jhbuild

           # Quickstart for those that do not use jhbuild:
           export PREFIX=/opt/xorg
           export LD_LIBRARY_PATH=$PREFIX/lib
           export PKG_CONFIG_PATH=$PREFIX/lib/pkgconfig
           export PATH=$PREFIX/bin:$PATH
           export ACLOCAL="aclocal -I $PREFIX/share/aclocal"

           git clone git://anongit.freedesktop.org/git/xorg/util/modular/ util/modular
           echo "util/macros" > built.modules
           ./util/modular/build.sh --clone -p -f built.modules -r `tail -n 1 built.modules` $PREFIX

           # Re-run the last command until a build succeeds.