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The following page has been changed by NigelDaley:
http://wiki.apache.org/lucene-hadoop/HowToRelease

The comment on the change is:
added option 64-bit build instructions

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        1. Build the release & run unit tests.  Note that releases are normally 
built on 32-bit Linux, so that they include the native code for that platform.  
Also, folks who build releases should install eclipse, so that the eclipse 
plugin can be included in releases, pre-compiled. {{{
  ant -Dversion=X.Y.Z -Dcompile.native=true -Dcompile.c++=true 
-Declipse.home=/usr/lib/eclipse clean package-libhdfs tar test test-libhdfs
+ }}}
+           '''Note:''' If a 64-bit Linux platform is available as well, then 
both 32-bit and 64-bit libraries may be built.  Instead of the above, perform 
the following: {{{
+ export JAVA_HOME=/path/to/32bit/jdk
+ ant -Dversion=X.Y.Z -Dcompile.native=true -Dcompile.c++=true 
-Declipse.home=/usr/lib/eclipse clean package-libhdfs tar test test-libhdfs
+ export JAVA_HOME=/path/to/64bit/jdk
+ ant -Dcompile.native compile-core-native tar
  }}}
        1. Check that release file looks ok - e.g. install it and run examples 
from tutorial.
          1. Generate the MD5 checksum of the release file. {{{

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