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/usr/share/gluegen2/make/gluegen-cpptasks-custom.xml is in libgluegen2-build-java 2.3.2-5.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>

<!--
    This is an example of how to add custom compiler/linker 
    arguments for a crosscompiler.

    You can use such files with setting the property 'gluegen-cpptasks.file', ie:

        -Dgluegen-cpptasks.file=`pwd`/lib/gluegen-cpptasks-linux-32bit.xml

    In case you want to compile for 32bit on a 64bit machine,
    you might also need to set the 'os.arch' to 'x86'.
    Example: gluegen/make/make.gluegen.all.linux-x86.sh
  -->

<project name="GlueGen-cpptasks" basedir="." >

<import file="../gluegen-cpptasks-base.xml" optional="false" />

<target name="gluegen.cpptasks.configure.compiler" depends="setup.java.home.dir">
    <echo message="Custom forced compiler.cfg.linux, linker.cfg.linux" />
    <compiler id="compiler.cfg.linux" name="gcc">
      <compilerarg value="-m32" />
      <compilerarg value="-Wall" />
      <defineset>
        <define name="LINUX" />
      </defineset>
    </compiler>

    <linker id="linker.cfg.linux" name="gcc">
      <linkerarg value="-m32" />
    </linker>

</target>

<target name="gluegen.cpptasks.declare.compiler" depends="setup.java.home.dir">
  <echo message="Custom forced Linux.x86" />
  <!--
  <property name="isLinux"    value="true"/>
  <property name="isLinuxX86" value="true"/>
  -->
  <property name="compiler.cfg.id.base"          value="compiler.cfg.linux" /> 
  <property name="linker.cfg.id.base"            value="linker.cfg.linux" /> 
  <property name="java.lib.dir.platform"         value="${java.home.dir}/jre/lib/i386" />
  <property name="java.includes.dir.platform"    value="${java.includes.dir}/linux" />
</target>

</project>