diff -Nru sagemath-7.4/debian/changelog sagemath-7.4/debian/changelog
--- sagemath-7.4/debian/changelog	2016-12-23 16:37:30.000000000 +0000
+++ sagemath-7.4/debian/changelog	2016-12-30 08:34:29.000000000 +0000
@@ -1,3 +1,10 @@
+sagemath (7.4-4ubuntu1) zesty; urgency=medium
+
+  * Adjust build-dependency on lcalc for Ubuntu in debian/control
+    and debian/control.runtime-depends
+
+ -- Graham Inggs <ginggs@ubuntu.com>  Fri, 30 Dec 2016 10:34:29 +0200
+
 sagemath (7.4-4) unstable; urgency=medium
 
   * Add a temporary exception to the i386 testsuite to allow the build to pass.
diff -Nru sagemath-7.4/debian/control sagemath-7.4/debian/control
--- sagemath-7.4/debian/control	2016-12-23 16:37:30.000000000 +0000
+++ sagemath-7.4/debian/control	2016-12-30 08:34:29.000000000 +0000
@@ -2,7 +2,8 @@
 Source: sagemath
 Section: math
 Priority: optional
-Maintainer: Debian Science Team <debian-science-maintainers@lists.alioth.debian.org>
+Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
+XSBC-Original-Maintainer: Debian Science Team <debian-science-maintainers@lists.alioth.debian.org>
 Uploaders: Tobias Hansen <thansen@debian.org>,
            Julien Puydt <julien.puydt@laposte.net>,
            Jerome Benoit <calculus@rezozer.net>,
@@ -26,7 +27,7 @@
  ipython (>= 5.1.0-2),
  iso-codes,
  jmol (>= 14.6.4),
- lcalc (>= 1.23+dfsg-6+b1),
+ lcalc (>= 1.23+dfsg-6build1),
  less,
  libcdd-tools (>= 094h),
  libjs-mathjax,
diff -Nru sagemath-7.4/debian/control.in sagemath-7.4/debian/control.in
--- sagemath-7.4/debian/control.in	2016-12-14 07:57:48.000000000 +0000
+++ sagemath-7.4/debian/control.in	2016-12-30 08:34:29.000000000 +0000
@@ -2,7 +2,8 @@
 Source: sagemath
 Section: math
 Priority: optional
-Maintainer: Debian Science Team <debian-science-maintainers@lists.alioth.debian.org>
+Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
+XSBC-Original-Maintainer: Debian Science Team <debian-science-maintainers@lists.alioth.debian.org>
 Uploaders: Tobias Hansen <thansen@debian.org>,
            Julien Puydt <julien.puydt@laposte.net>,
            Jerome Benoit <calculus@rezozer.net>,
diff -Nru sagemath-7.4/debian/control.runtime-depends sagemath-7.4/debian/control.runtime-depends
--- sagemath-7.4/debian/control.runtime-depends	2016-12-18 09:33:49.000000000 +0000
+++ sagemath-7.4/debian/control.runtime-depends	2016-12-30 08:34:29.000000000 +0000
@@ -11,7 +11,7 @@
  ipython (>= 5.1.0-2),
  iso-codes,
  jmol (>= 14.6.4),
- lcalc (>= 1.23+dfsg-6+b1),
+ lcalc (>= 1.23+dfsg-6+build1),
  less,
  libcdd-tools (>= 094h),
  libjs-mathjax,