Prove rel_interior_convex_hull_union (by Grechuck Bogdan).
#!/usr/bin/env bash
#
# Author: Lukas Bulwahn, TU Muenchen, 2010
#
# Determine SWI-Prolog version
if [ "$EXEC_SWIPL" = "" ]; then
echo ""
else
VERSION=`$EXEC_SWIPL --version`
echo `expr match "$VERSION" 'SWI-Prolog version \([0-9\.]*\)'`
fi