diff -Nru grok-1.20110708.1/debian/changelog grok-1.20110708.1/debian/changelog
--- grok-1.20110708.1/debian/changelog	2020-01-13 22:12:23.000000000 +0000
+++ grok-1.20110708.1/debian/changelog	2020-04-25 19:57:15.000000000 +0000
@@ -1,3 +1,10 @@
+grok (1.20110708.1-4.5) unstable; urgency=medium
+
+  * Non-maintainer upload.
+  * Fix FTBFS with GCC-10. (Closes: #957309)
+
+ -- Sudip Mukherjee <sudipm.mukherjee@gmail.com>  Sat, 25 Apr 2020 20:57:15 +0100
+
 grok (1.20110708.1-4.4) unstable; urgency=medium
 
   * Non-maintainer upload.
diff -Nru grok-1.20110708.1/debian/patches/fix_gcc10.patch grok-1.20110708.1/debian/patches/fix_gcc10.patch
--- grok-1.20110708.1/debian/patches/fix_gcc10.patch	1970-01-01 00:00:00.000000000 +0000
+++ grok-1.20110708.1/debian/patches/fix_gcc10.patch	2020-04-25 19:55:43.000000000 +0000
@@ -0,0 +1,19 @@
+Description: Fix FTBFS with GCC-10
+ Fix multiple definitions of a variable by declaring it as  extern
+
+Author: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
+Bug-Debian: https://bugs.debian.org/957309
+
+---
+
+--- grok-1.20110708.1.orig/conf.tab.c
++++ grok-1.20110708.1/conf.tab.c
+@@ -77,7 +77,7 @@
+ #include "grok_input.h"
+ #include "grok_matchconf.h"
+ 
+-int yylineno;
++extern int yylineno;
+ void yyerror (YYLTYPE *loc, struct config *conf, char const *s) {
+   fprintf (stderr, "Syntax error: %s\n", s);
+ }
diff -Nru grok-1.20110708.1/debian/patches/series grok-1.20110708.1/debian/patches/series
--- grok-1.20110708.1/debian/patches/series	2020-01-13 22:08:30.000000000 +0000
+++ grok-1.20110708.1/debian/patches/series	2020-04-25 19:56:14.000000000 +0000
@@ -6,3 +6,4 @@
 fix-gperf-version-detection.patch
 gperf-function-declaration.patch
 move_ldflags.patch
+fix_gcc10.patch