POSTIN

/bin/sh

/usr/sbin/update-alternatives --install /usr/bin/gcj gcj /usr/bin/gcj-4.0.1 300400
[ -e /usr/bin/gcj ] || /usr/sbin/update-alternatives --auto gcj
/usr/sbin/update-alternatives --install /usr/bin/jdk-config jdk-config /usr/bin/gcj-jdk-config-4.0.1 20

POSTUN

/bin/sh

if [ ! -f /usr/bin/gcj-4.0.1 ]; then
  /usr/sbin/update-alternatives --remove gcj /usr/bin/gcj-4.0.1
fi
if [ ! -f /usr/bin/gcj-jdk-config-4.0.1 ]; then
  /usr/sbin/update-alternatives --remove jdk-config /usr/bin/gcj-jdk-config-4.0.1
fi