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Again, anyone can do this. Use a command like:
svn checkout https://svn.apache.org/repos/asf/geronimo/server/trunk
server
Commit Changes to Subversion
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Building Geronimo from Source
Refer to the wiki Building Apache Geronimo for the build procedure. It typically takes 10-30 minutes for a full build, and it needs to be run while online in order to download or update a large number of dependencies.