By defining the environment var JIKES (in DOS or *NIX) it tries to use jikes - assumed 
to be on your path - gives a factor of 10 speed improvement on my humble Cyrix 686 
200mhz under Linux2.2.14

Chris

Index: build-turbine.bat
===================================================================
RCS file: /products/cvs/turbine/turbine/build/build-turbine.bat,v
retrieving revision 1.19
diff -r1.19 build-turbine.bat
50a51,55
> REM set JIKES to be non-null (eg set JIKES=Y) to use the jikes compiler - its a bit 
>faster
> REM get it from here... 
>http://oss.software.ibm.com/developerworks/opensource/jikes/project
> set JAVAC=classic
> if not "%JIKES%" == "" set JAVAC=jikes
>
61c66
< %JAVA_HOME%\bin\java.exe -classpath "%CP%" org.apache.tools.ant.Main -buildfile 
%BUILDFILE% %TARGET%
---
> %JAVA_HOME%\bin\java.exe -classpath "%CP%" -DJAVAC=%JAVAC% org.apache.tools.ant.Main 
>-buildfile %BUILDFILE% %TARGET%
Index: build-turbine.sh
===================================================================
RCS file: /products/cvs/turbine/turbine/build/build-turbine.sh,v
retrieving revision 1.20
diff -r1.20 build-turbine.sh
54a55,62
> if test -z "${JIKES}" ; then
>         JAVAC=classic
> else
>         JAVAC=jikes
> fi
>
> echo JAVAC = ${JAVAC}
>
61c69
< ${JAVA_HOME}/bin/java -classpath ${CP} org.apache.tools.ant.Main -buildfile 
${BUILDFILE} ${TARGET}
---
> ${JAVA_HOME}/bin/java -classpath ${CP} -DJAVAC=${JAVAC} org.apache.tools.ant.Main 
>-buildfile ${BUILDFILE} ${TARGET}
Index: build-turbine.xml
===================================================================
RCS file: /products/cvs/turbine/turbine/build/build-turbine.xml,v
retrieving revision 1.16
diff -r1.16 build-turbine.xml
11c11
<         <property name="build.compiler" value="classic"/>
---
>         <property name="build.compiler" value="${JAVAC}"/>
"There is no spoon"
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