building icedtea-7 on ARM

[Grant]

I'm trying to build icedtea-7 on an ARM Gentoo system (Pandaboard ES)
but it fails.  I have gcj-jdk-4.8.2 and gcc-4.8.2 with gcj support
compiled in.  icedtea-6 builds fine but I need icedtea-7.  Does anyone
know how to get this to build on ARM?

'/var/tmp/portage/dev-java/icedtea-7.2.4.3/work/icedtea-2.4.3/tz.properties'
-> '/var/tmp/portage/dev-java/icedtea-7.2.4.3/work/icedtea-2.4.3/openjdk.build-boot/j2sdk-image/jre/lib/tz.properties'
touch stamps/add-tzdata-support-boot.stamp
mkdir -p /var/tmp/portage/dev-java/icedtea-7.2.4.3/work/icedtea-2.4.3/cryptocheck.build
/var/tmp/portage/dev-java/icedtea-7.2.4.3/work/icedtea-2.4.3/bootstrap/jdk1.6.0/bin/javac
-g -encoding utf-8    -source 7 -target 7 \
  -d /var/tmp/portage/dev-java/icedtea-7.2.4.3/work/icedtea-2.4.3/cryptocheck.build
./TestCryptoLevel.java
Annotation processing got disabled, since it requires a 1.6 compliant JVM
mkdir -p stamps
touch stamps/cryptocheck.stamp
if [ -e /var/tmp/portage/dev-java/icedtea-7.2.4.3/work/icedtea-2.4.3/openjdk.build-boot/j2sdk-image/bin/java
] ; then \
  /var/tmp/portage/dev-java/icedtea-7.2.4.3/work/icedtea-2.4.3/openjdk.build-boot/j2sdk-image/bin/java
-cp /var/tmp/portage/dev-java/icedtea-7.2.4.3/work/icedtea-2.4.3/cryptocheck.build
TestCryptoLevel ; \
fi
Exception in thread "main" java.lang.NullPointerException
        at java.lang.Throwable.fillInStackTrace(Throwable.java:783)
        at java.lang.Throwable.<init>(Throwable.java:250)
        at java.lang.Exception.<init>(Exception.java:54)
        at java.lang.RuntimeException.<init>(RuntimeException.java:51)
        at java.lang.NullPointerException.<init>(NullPointerException.java:60)
        at TestCryptoLevel.main(TestCryptoLevel.java:46)
make: *** [stamps/check-crypto-boot.stamp] Error 1

- Grant