Index: head/math/glgraph/pkg-descr
===================================================================
--- head/math/glgraph/pkg-descr	(revision 448895)
+++ head/math/glgraph/pkg-descr	(revision 448896)
@@ -1,4 +1,4 @@
 GLgraph visualize mathematical functions. It can handle 3 unknowns (x,z,t) and
 can produce a 4D function with 3 space and 1 time dimension.
 
-WWW: http://glgraph.kaosu.ch/
+WWW: https://glgraph.kaosu.ch/