Error when compiling corba orb files

[Thomas Anderson]

I download openjdk 6 source from
http://download.java.net/openjdk/jdk6/ and follow README-builds.html
to build jdk from source. But the make result shows the error as
below:

# Running javac:
/usr/lib/jvm/java-6-openjdk/bin/java -client -Xmx896m -Xms128m
-XX:PermSize=32m -XX:MaxPermSize=160m
-Xbootclasspath/p:/home/clin/openjdk6/build/linux-i586/langtools/dist/bootstrap/lib/javac.jar
-jar /home/clin/openjdk6/build/linux-i586/langtools/dist/bootstrap/lib/javac.jar
-XDignore.symbol.file=true -source 1.5 -target 5 -encoding ascii
-classpath /usr/lib/jvm/java-6-openjdk/lib/tools.jar -sourcepath
/home/clin/openjdk6/build/linux-i586/corba/gensrc:../../../../../../src/solaris/classes:../../../../../../src/share/classes
-d /home/clin/openjdk6/build/linux-i586/corba/classes
@/home/clin/openjdk6/build/linux-i586/corba/tmp/sun/com.sun.corba.se.impl.corespi/.classes.list
../../../../../../src/share/classes/com/sun/corba/se/spi/orb/OperationFactory.java:449:
cannot find symbol
symbol  : method compactObjectToString(com.sun.corba.se.spi.orb.Operation[])
location: class com.sun.corba.se.impl.orbutil.ObjectUtility
                ObjectUtility.compactObjectToString(actions) + ")" ;
                             ^
../../../../../../src/share/classes/com/sun/corba/se/spi/orb/OperationFactory.java:536:
cannot find symbol
symbol  : method compactObjectToString(com.sun.corba.se.spi.orb.Operation[])
location: class com.sun.corba.se.impl.orbutil.ObjectUtility
                ObjectUtility.compactObjectToString(op) + ")" ;
                             ^
../../../../../../src/share/classes/com/sun/corba/se/spi/orb/ParserImplBase.java:128:
cannot find symbol
symbol  : method compactObjectToString(java.lang.Object)
location: class com.sun.corba.se.impl.orbutil.ObjectUtility
                    ObjectUtility.compactObjectToString(value) ) ;
                                 ^
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

The command used to build the source is exactly the same as described
in README-builds.html#debian

What might be the root cause or how to solve this problem?

Environment: GNU Make 3.81, GNU/ Linux Debian (kernel 2.6.35.4), gcc
(Debian 4.4.5-8) 4.4.5

Thanks.