gnu: Add libhilbert.

* gnu/packages/maths.scm (libhilbert): New variable.

gnu/packages/maths.scm

@@ -2538,3 +2538,25 @@ structured and unstructured grid problems.")))
     (description "Matio is a library for reading and writing MAT files.  It
 supports compressed MAT files, as well as newer (version 7.3) MAT files.")
     (license license:bsd-2)))
+
+(define-public libhilbert
+  (package
+    (name "libhilbert")
+    (version "0.2-1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append "http://web.cs.dal.ca/~chamilto/hilbert/"
+                           "libhilbert-" version ".tar.gz"))
+       (sha256
+        (base32
+         "0v48x8405dj95gjn2saja4bzhw86d6zl6d3dg8h7dzac2qr97s34"))))
+    (build-system gnu-build-system)
+    (home-page "http://web.cs.dal.ca/~chamilto/hilbert")
+    (synopsis "Hilbert indices for multidimensional data")
+    (description "The libhilbert library can efficiently calculate Hilbert
+curves and order-preserving representations of Hilbert curve indices that use
+the same amount of space as the original point representation.  This is useful
+when using the Gilbert curve as a space filling curve through a
+high-dimensional space where not all demensions have the same cardinality.")
+    (license license:lgpl2.1+)))