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[...]
dh_clean
dh_clean: Compatibility levels before 5 are deprecated.
 debian/rules build
dh_testdir
if [ ! -d build ]; then mkdir build; mkdir build/api; fi	
touch configure-stamp
dh_testdir
/usr/lib/jvm/default-java/bin/javac -nowarn -sourcepath src -classpath /usr/share/java/jdom1.jar -d build `find src -name \*.java`
cp -r src/META-INF build
cp debian/MANIFEST.MF build/META-INF
# split off jdom classes, everything else into saxon.jar
(cd build; /usr/lib/jvm/default-java/bin/jar -cfM ../saxon.jar META-INF `find . -name \*.class | egrep -v com/icl/saxon/jdom`; \
	 /usr/lib/jvm/default-java/bin/jar -cfM ../saxon-jdom.jar com/icl/saxon/jdom/*.class )
(cd build/api ; gjdoc -sourcepath ../../src @../../debian/libsaxon-java-doc.javadoc)
Loading classes for package com.icl.saxon...
Loading classes for package com.icl.saxon.aelfred...
Loading classes for package com.icl.saxon.charcode...
Loading classes for package com.icl.saxon.expr...
Loading classes for package com.icl.saxon.exslt...
Loading classes for package com.icl.saxon.functions...
Loading classes for package com.icl.saxon.handlers...
Loading classes for package com.icl.saxon.jdom...
Loading classes for package com.icl.saxon.number...
Loading classes for package com.icl.saxon.om...
Loading classes for package com.icl.saxon.output...
Loading classes for package com.icl.saxon.pattern...
Loading classes for package com.icl.saxon.sort...
java.nio.charset.UnmappableCharacterException: Input length = 1
   at java.nio.charset.CoderResult.throwException(libgcj.so.10)
   at gnu.classpath.tools.NotifyingInputStreamReader.fillCharBuf(libgcj-tools.so.10)
   at gnu.classpath.tools.NotifyingInputStreamReader.read(libgcj-tools.so.10)
   at java.io.BufferedReader.read(libgcj.so.10)
   at java.io.Reader.read(libgcj.so.10)
   at gnu.classpath.tools.IOToolkit.readFully(libgcj-tools.so.10)
   at gnu.classpath.tools.gjdoc.Parser.loadFile(libgcj-tools.so.10)
   at gnu.classpath.tools.gjdoc.Parser.processSourceFile(libgcj-tools.so.10)
   at gnu.classpath.tools.gjdoc.Parser.processSourceDir(libgcj-tools.so.10)
   at gnu.classpath.tools.gjdoc.RootDocImpl.build(libgcj-tools.so.10)
   at gnu.classpath.tools.gjdoc.Main.startDoclet(libgcj-tools.so.10)
   at gnu.classpath.tools.gjdoc.Main.start(libgcj-tools.so.10)
   at gnu.classpath.tools.gjdoc.Main.main(libgcj-tools.so.10)
make: *** [build-stamp] Error 5
dpkg-buildpackage: error: debian/rules build gave error exit status 2