I think Lintian now also complains that git:// is not secure, so I
suggest changing:
Vcs-Git: git://anonscm.debian.org/debian-science/packages/superlu.git
to:
Vcs-Git: https://anonscm.debian.org/git/debian-science/packages/superlu.git
and then:
Vcs-Browser: https://anonscm.debian.org/cgit/debian-science/packages/superlu.git