virtualDestructor
ftp://ftp.de.debian.org/debian/pool/main/v/voro++/voro++_0.5+revert-to-0.4.6+dfsg1.orig.tar.gz
voro++-0.4.6/src/cell.hh:87:4: warning:inconclusive: Class 'voronoicell_base' which has virtual members does not have a virtual destructor. [virtualDestructor]