POSTIN

/bin/sh

/bin/grep -q checkstyle-optional /etc/ant.d/checkstyle || \
/usr/bin/perl -p -i -e 's|checkstyle|checkstyle checkstyle-optional|' /etc/ant.d/checkstyle

POSTUN

/bin/sh

/bin/grep -q checkstyle-optional /etc/ant.d/checkstyle && \
/usr/bin/perl -p -i -e 's|checkstyle-optional ||' /etc/ant.d/checkstyle || :