diff -Nru bird-1.6.0/debian/changelog bird-1.6.0/debian/changelog
--- bird-1.6.0/debian/changelog	2016-04-30 15:16:16.000000000 -0400
+++ bird-1.6.0/debian/changelog	2016-09-12 21:59:37.000000000 -0400
@@ -1,3 +1,10 @@
+bird (1.6.0-2) unstable; urgency=medium
+
+  * Non-maintainer upload.
+  * Replace build dependency on sp with opensp.
+
+ -- Neil Roeth <neil@debian.org>  Mon, 12 Sep 2016 21:59:37 -0400
+
 bird (1.6.0-1) unstable; urgency=medium
 
   * Imported Upstream version 1.6.0
diff -Nru bird-1.6.0/debian/control bird-1.6.0/debian/control
--- bird-1.6.0/debian/control	2016-04-30 15:16:16.000000000 -0400
+++ bird-1.6.0/debian/control	2016-09-12 21:59:37.000000000 -0400
@@ -12,7 +12,7 @@
                linuxdoc-tools-latex,
                m4,
                quilt,
-               sp,
+               opensp,
                xsltproc
 Maintainer: Ondřej Surý <ondrej@debian.org>
 Standards-Version: 3.9.6
diff -Nru bird-1.6.0/debian/patches/012-replace-sp-with-opensp.patch bird-1.6.0/debian/patches/012-replace-sp-with-opensp.patch
--- bird-1.6.0/debian/patches/012-replace-sp-with-opensp.patch	1969-12-31 19:00:00.000000000 -0500
+++ bird-1.6.0/debian/patches/012-replace-sp-with-opensp.patch	2016-09-12 21:59:37.000000000 -0400
@@ -0,0 +1,33 @@
+--- a/doc/sgml2html
++++ b/doc/sgml2html
+@@ -26,7 +26,7 @@
+ use lib "/usr/lib/perl5";
+ use lib "/usr/share/perl5";
+ $progs = {
+-  "NSGMLS" => "/usr/bin/nsgmls",
++  "NSGMLS" => "/usr/bin/onsgmls",
+   "SGMLSASP" => "/usr/bin/sgmlsasp",
+   "GROFF" => "/usr/bin/groff",
+   "GROFFMACRO" => "-ms",
+--- a/doc/sgml2latex
++++ b/doc/sgml2latex
+@@ -26,7 +26,7 @@
+ use lib "/usr/lib/perl5";
+ use lib "/usr/share/perl5";
+ $progs = {
+-  "NSGMLS" => "/usr/bin/nsgmls",
++  "NSGMLS" => "/usr/bin/onsgmls",
+   "SGMLSASP" => "/usr/bin/sgmlsasp",
+   "GROFF" => "/usr/bin/groff",
+   "GROFFMACRO" => "-ms",
+--- a/doc/sgml2txt
++++ b/doc/sgml2txt
+@@ -26,7 +26,7 @@
+ use lib "/usr/lib/perl5";
+ use lib "/usr/share/perl5";
+ $progs = {
+-  "NSGMLS" => "/usr/bin/nsgmls",
++  "NSGMLS" => "/usr/bin/onsgmls",
+   "SGMLSASP" => "/usr/bin/sgmlsasp",
+   "GROFF" => "/usr/bin/groff",
+   "GROFFMACRO" => "-ms",
diff -Nru bird-1.6.0/debian/patches/series bird-1.6.0/debian/patches/series
--- bird-1.6.0/debian/patches/series	2016-04-30 15:16:16.000000000 -0400
+++ bird-1.6.0/debian/patches/series	2016-09-12 21:59:37.000000000 -0400
@@ -1,3 +1,4 @@
 011-generate_docs_with_modern_linuxdoc.patch
 009-link_using_ld.patch
 010-split_example_config_files.patch
+012-replace-sp-with-opensp.patch