Compiling OpenJDK6 w/ jdk7 on Fatdog64

init-src-dirs:
     [echo] Using primary.src.dir=./drop_included/jaxws_src/src
     [echo] Using src.dir.id=/tmp/SBo/openjdk6/icedtea-build/openjdk-ecj/jaxws/drop_included/jaxws_src/src:/tmp/SBo/openjdk6/icedtea-build/openjdk-ecj/jaxws/drop_included/jaf_src/src

compile:
    [javac] Compiling 2568 source files to /tmp/SBo/openjdk6/icedtea-build/openjdk.build-ecj/jaxws/build/classes
    [javac] /tmp/SBo/openjdk6/icedtea-build/openjdk-ecj/jdk/src/solaris/classes/java/lang/ProcessImpl.java:81: cannot find symbol
    [javac] symbol  : constructor UNIXProcess(byte[],byte[],int,byte[],int,byte[],boolean)
    [javac] location: class java.lang.UNIXProcess
    [javac]         return new UNIXProcess
    [javac]                ^
    [javac] Note: Some input files use or override a deprecated API.
    [javac] Note: Recompile with -Xlint:deprecation for details.
    [javac] Note: Some input files use unchecked or unsafe operations.
    [javac] Note: Recompile with -Xlint:unchecked for details.
    [javac] 1 error

BUILD FAILED
/tmp/SBo/openjdk6/icedtea-build/openjdk-ecj/jaxws/build.xml:136: Compile failed; see the compiler error output for details.

Total time: 1 minute 6 seconds
Makefile:155: recipe for target 'all' failed
make[3]: *** [all] Error 1
make[3]: Leaving directory '/tmp/SBo/openjdk6/icedtea-build/openjdk-ecj/jaxws/make'
make/jaxws-rules.gmk:42: recipe for target 'jaxws-build' failed
make[2]: *** [jaxws-build] Error 2
make[2]: Leaving directory '/tmp/SBo/openjdk6/icedtea-build/openjdk-ecj'
Makefile:198: recipe for target 'build_product_image' failed
make[1]: *** [build_product_image] Error 2
make[1]: Leaving directory '/tmp/SBo/openjdk6/icedtea-build/openjdk-ecj'
Makefile:2604: recipe for target 'stamps/icedtea-ecj.stamp' failed
make: *** [stamps/icedtea-ecj.stamp] Error 2