diff -Nru unbound-1.4.18/debian/changelog unbound-1.4.18/debian/changelog
--- unbound-1.4.18/debian/changelog	2012-08-06 03:54:35.000000000 +0200
+++ unbound-1.4.18/debian/changelog	2013-03-26 15:01:53.000000000 +0100
@@ -1,3 +1,11 @@
+unbound (1.4.18-1~ubuntu12.04.1) precise-backports; urgency=low
+
+  * Source change backport to Precise (LP: #1158766)
+    - build with --disable-ecdsa
+    - do not depend on libldns-dev (>= 1.6.13~)
+
+ -- Michael Vogt <michael.vogt@ubuntu.com>  Tue, 26 Mar 2013 15:01:53 +0100
+
 unbound (1.4.18-1) unstable; urgency=low
 
   * New upstream release.
diff -Nru unbound-1.4.18/debian/control unbound-1.4.18/debian/control
--- unbound-1.4.18/debian/control	2012-08-06 03:54:35.000000000 +0200
+++ unbound-1.4.18/debian/control	2013-03-26 14:59:27.000000000 +0100
@@ -3,7 +3,7 @@
 Priority: optional
 Maintainer: Robert S. Edmonds <edmonds@debian.org>
 Build-Depends: dpkg-dev (>= 1.16.1~), debhelper (>= 9~), doxygen,
- autoconf, automake, autotools-dev, libtool, flex, bison, libldns-dev (>= 1.6.13~),
+ autoconf, automake, autotools-dev, libtool, flex, bison, libldns-dev,
  libssl-dev, libevent-dev, libexpat1-dev, python-all-dev (>= 2.6.6-3~),
  python-support, swig
 Standards-Version: 3.9.3
diff -Nru unbound-1.4.18/debian/rules unbound-1.4.18/debian/rules
--- unbound-1.4.18/debian/rules	2012-08-06 03:54:35.000000000 +0200
+++ unbound-1.4.18/debian/rules	2013-03-26 14:59:27.000000000 +0100
@@ -29,6 +29,7 @@
 		--with-pidfile=/var/run/unbound.pid \
 		--with-libevent \
 		--with-pythonmodule \
+                --disable-ecdsa \
 		--with-pyunbound
 	$(MAKE) unbound
 	install -D -m 0755 unbound debian/unbound/usr/sbin/unbound
@@ -54,6 +55,7 @@
 		--without-libevent \
 		--without-pythonmodule \
 		--without-pyunbound \
+                --disable-ecdsa \
 		--libdir=/usr/lib/$(DEB_HOST_MULTIARCH)
 
 	$(MAKE)