diff -pruN 5.6.18+dfsg-4/debian/changelog 5.6.18+dfsg-4ubuntu1/debian/changelog
--- 5.6.18+dfsg-4/debian/changelog	2016-02-15 11:42:38.000000000 +0000
+++ 5.6.18+dfsg-4ubuntu1/debian/changelog	2016-02-16 07:05:44.000000000 +0000
@@ -1,3 +1,10 @@
+php5.6 (5.6.18+dfsg-4ubuntu1) xenial; urgency=medium
+
+  * Drop build-dependency on firebird.
+  * Regenerate the control file.
+
+ -- Matthias Klose <doko@ubuntu.com>  Tue, 16 Feb 2016 08:05:12 +0100
+
 php5.6 (5.6.18+dfsg-4) unstable; urgency=medium
 
   * Resolve ltmain.sh link based on libtool version
diff -pruN 5.6.18+dfsg-4/debian/control.in 5.6.18+dfsg-4ubuntu1/debian/control.in
--- 5.6.18+dfsg-4/debian/control.in	2016-02-15 11:42:38.000000000 +0000
+++ 5.6.18+dfsg-4ubuntu1/debian/control.in	2016-02-16 07:06:00.000000000 +0000
@@ -14,7 +14,6 @@ Build-Depends: apache2-dev (>= 2.4),
                dh-apache2,
                dh-systemd (>= 1.3),
                dpkg-dev (>= 1.16.1~),
-               firebird-dev [!hurd-any !m68k !hppa !ppc64] | firebird2.5-dev [!hurd-any !m68k !hppa !ppc64] | firebird2.1-dev [!hurd-any !m68k !hppa !ppc64],
                flex,
                freetds-dev,
                libapparmor-dev,