Hi,
I just svn checkout xwiki from http://svn.xwiki.org/svnroot/xwiki/trunks and follow the document http://dev.xwiki.org/xwiki/bin/view/Community/Building to build it. I get the following error:

Missing:
----------
1) com.xpn.xwiki.platform:xwiki-build-xar-handlers:jar:1.8-SNAPSHOT

Try downloading the file manually from the project website.

Then, install it using the command:
      mvn install:install-file -DgroupId= com.xpn.xwiki.platform -DartifactId=xwiki-build-xar-handlers \
          -Dversion=1.8-SNAPSHOT -Dpackaging=jar -Dfile=/path/to/file

Path to dependency:
        1) com.xpn.xwiki.platform:xwiki-externals:pom:UNVERSIONED
        2) com.xpn.xwiki.platform:xwiki-build-xar-handlers:jar:1.8-SNAPSHOT

----------
1 required artifact is missing.

for artifact:
com.xpn.xwiki.platform:xwiki-externals:pom:UNVERSIONED

from the specified remote repositories:
xwiki-releases (http://maven.xwiki.org/releases),
central (http://repo1.maven.org/maven2 ),
xwiki-snapshots (http://maven.xwiki.org/snapshots),
xwiki-externals (http://maven.xwiki.org/externals)

Any clue?

Regards,
Rice