libcneartree7 5.1.1+dfsg1-1 (ppc64el binary) in ubuntu disco

 Neartree is an API and a library for finding nearest neighbors among
 points in spaces of arbitrary dimensions.
 .
 The library uses the Nearest Neighbor algorithm after Kalantari and
 McDonald, (IEEE Transactions on Software Engineering, v. SE-9, pp.
 631-634,1983) modified to use recursion instead of a double-linked tree
 and simplified so that it does less checking for things like is the
 distance to the right less than the distance to the left; it was found
 that these checks make little to no difference.