diff -Nru bird2-2.0.7/debian/changelog bird2-2.0.7/debian/changelog
--- bird2-2.0.7/debian/changelog	2020-05-11 08:29:24.000000000 +0000
+++ bird2-2.0.7/debian/changelog	2021-01-02 17:12:44.000000000 +0000
@@ -1,3 +1,10 @@
+bird2 (2.0.7-4.1) unstable; urgency=medium
+
+  * Non-maintainer upload.
+  * Fix collect2: error: ld returned 1 exit status (Closes: #966906)
+
+ -- Benjamin Drung <bdrung@debian.org>  Sat, 02 Jan 2021 18:12:44 +0100
+
 bird2 (2.0.7-4) unstable; urgency=medium
 
   * Sync the linuxdoc mangled files with linuxdoc-tools_0.9.73-2
diff -Nru bird2-2.0.7/debian/patches/0002-Added-missing-extern.patch bird2-2.0.7/debian/patches/0002-Added-missing-extern.patch
--- bird2-2.0.7/debian/patches/0002-Added-missing-extern.patch	1970-01-01 00:00:00.000000000 +0000
+++ bird2-2.0.7/debian/patches/0002-Added-missing-extern.patch	2021-01-02 17:12:14.000000000 +0000
@@ -0,0 +1,33 @@
+From 4bbc10614f3431c37e6352f5a6ea5c693c31021e Mon Sep 17 00:00:00 2001
+From: Maria Matejka <mq@ucw.cz>
+Date: Tue, 4 Feb 2020 10:11:16 +0100
+Subject: Added missing extern
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Thanks to Robert Scheck <bird@robert-scheck.de> who reported it
+and Toke Høiland-Jørgensen <toke@toke.dk> who suggested this patch.
+
+Bug-Debian: https://bugs.debian.org/966906
+Origin: https://gitlab.nic.cz/labs/bird/-/commit/4bbc1061
+---
+ nest/route.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/nest/route.h b/nest/route.h
+index d2a07f09..b927db5f 100644
+--- a/nest/route.h
++++ b/nest/route.h
+@@ -458,7 +458,7 @@ typedef struct rta {
+ 					   protocol-specific metric is availabe */
+ 
+ 
+-const char * rta_dest_names[RTD_MAX];
++extern const char * rta_dest_names[RTD_MAX];
+ 
+ static inline const char *rta_dest_name(uint n)
+ { return (n < RTD_MAX) ? rta_dest_names[n] : "???"; }
+-- 
+2.27.0
+
diff -Nru bird2-2.0.7/debian/patches/series bird2-2.0.7/debian/patches/series
--- bird2-2.0.7/debian/patches/series	2020-05-11 08:29:24.000000000 +0000
+++ bird2-2.0.7/debian/patches/series	2021-01-02 17:11:46.000000000 +0000
@@ -1 +1,2 @@
 0001-Sync-the-linuxdoc-mangled-files-with-linuxdoc-tools_.patch
+0002-Added-missing-extern.patch