diff -Nru unison2.40.102-2.40.102/debian/changelog unison2.40.102-2.40.102/debian/changelog
--- unison2.40.102-2.40.102/debian/changelog	2016-08-01 08:32:23.000000000 +0000
+++ unison2.40.102-2.40.102/debian/changelog	2016-08-04 08:03:56.000000000 +0000
@@ -1,3 +1,10 @@
+unison2.40.102 (2.40.102-3~ubuntu12.04.1~ppa2) precise; urgency=low
+
+  * Update dependency to ensure this is built with the pre-4.0.2 OCaml
+    from trusty, not a xenial backport.
+
+ -- Zak Kipling <zak.kipling@cantab.net>  Thu, 04 Aug 2016 09:03:00 +0100
+
 unison2.40.102 (2.40.102-3~ubuntu12.04.1~ppa1) precise; urgency=medium
 
   * No-change backport to precise
diff -Nru unison2.40.102-2.40.102/debian/control unison2.40.102-2.40.102/debian/control
--- unison2.40.102-2.40.102/debian/control	2015-07-06 15:15:47.000000000 +0000
+++ unison2.40.102-2.40.102/debian/control	2016-08-04 08:03:04.000000000 +0000
@@ -7,6 +7,7 @@
 Build-Depends: cdbs (>= 0.4.23),
  debhelper (>= 7),
  ocaml-nox (>= 3.10.0-8),
+ ocaml-nox (<< 4.02),
  liblablgtk2-ocaml-dev (>= 2.12.0-2),
  chrpath,
  librsvg2-bin (>= 2.18.2),