Thanks for your bug-report. I have already been working on fix for this issue, and have cryptmount-5.1-2 awaiting upload with the support of my sponsor.
For the time being, these packages are available at http://www.rwpenney.org.uk/software The new build-system uses debhelper v7 and dh-autoreconf, so should be a more robust solution in the long term. RW Penney
