diff -u ipv6calc-1.0.0/debian/changelog ipv6calc-1.0.0/debian/changelog
--- ipv6calc-1.0.0/debian/changelog
+++ ipv6calc-1.0.0/debian/changelog
@@ -1,3 +1,10 @@
+ipv6calc (1.0.0-1.1) unstable; urgency=medium
+
+  * Non-maintainer upload.
+  * Fix ftbfs with GCC-10. (Closes: #957372)
+
+ -- Sudip Mukherjee <sudipm.mukherjee@gmail.com>  Tue, 18 Aug 2020 18:48:51 +0100
+
 ipv6calc (1.0.0-1) unstable; urgency=medium
 
   * New upstream version 1.0.0
only in patch2:
unchanged:
--- ipv6calc-1.0.0.orig/ipv6logconv/ipv6logconv.c
+++ ipv6calc-1.0.0/ipv6logconv/ipv6logconv.c
@@ -43,6 +43,7 @@
 
 long int ipv6calc_debug = 0; // ipv6calc_debug usage ok
 int flag_nocache = 0;
+int cache_lru_limit;
 
 /* supported output types:
  *  ipv6addr
only in patch2:
unchanged:
--- ipv6calc-1.0.0.orig/ipv6logconv/ipv6logconv.h
+++ ipv6calc-1.0.0/ipv6logconv/ipv6logconv.h
@@ -21,7 +21,7 @@
 #define DEBUG_ipv6logconv_processing   0x00000002l
 
 /* prototyping */
-int cache_lru_limit;
+extern int cache_lru_limit;
 
 extern int feature_reg;
 extern int feature_ieee;