diff -Nru librdkafka-0.8.6/debian/changelog librdkafka-0.8.6/debian/changelog
--- librdkafka-0.8.6/debian/changelog	2015-07-19 06:41:21.000000000 +0800
+++ librdkafka-0.8.6/debian/changelog	2015-12-21 21:22:57.000000000 +0800
@@ -1,3 +1,12 @@
+librdkafka (0.8.6-1.1) unstable; urgency=medium
+
+  * Non-maintainer upload.
+  * Use size_t instead of int for hexdump to fix FTBFS (Closes: 799993):
+    assuming signed overflow does not occur when
+    assuming that (X + c) >= X is always true  
+
+ -- YunQiang Su <syq@debian.org>  Mon, 21 Dec 2015 21:20:59 +0800
+
 librdkafka (0.8.6-1) unstable; urgency=medium
 
   * New upstream release.
diff -Nru librdkafka-0.8.6/debian/patches/0002_hexdump_use_size_t_instead_of_int.diff librdkafka-0.8.6/debian/patches/0002_hexdump_use_size_t_instead_of_int.diff
--- librdkafka-0.8.6/debian/patches/0002_hexdump_use_size_t_instead_of_int.diff	1970-01-01 08:00:00.000000000 +0800
+++ librdkafka-0.8.6/debian/patches/0002_hexdump_use_size_t_instead_of_int.diff	2015-12-21 21:18:40.000000000 +0800
@@ -0,0 +1,72 @@
+Index: b/examples/rdkafka_example.c
+===================================================================
+--- a/examples/rdkafka_example.c
++++ b/examples/rdkafka_example.c
+@@ -63,26 +63,26 @@ static void stop (int sig) {
+ 
+ static void hexdump (FILE *fp, const char *name, const void *ptr, size_t len) {
+ 	const char *p = (const char *)ptr;
+-	int of = 0;
++	size_t of = 0;
+ 
+ 
+ 	if (name)
+-		fprintf(fp, "%s hexdump (%zd bytes):\n", name, len);
++		fprintf(fp, "%s hexdump (%zu bytes):\n", name, len);
+ 
+ 	for (of = 0 ; of < len ; of += 16) {
+ 		char hexen[16*3+1];
+ 		char charen[16+1];
+-		int hof = 0;
++		size_t hof = 0;
+ 
+-		int cof = 0;
+-		int i;
++		size_t cof = 0;
++		size_t i;
+ 
+ 		for (i = of ; i < of + 16 && i < len ; i++) {
+ 			hof += sprintf(hexen+hof, "%02x ", p[i] & 0xff);
+ 			cof += sprintf(charen+cof, "%c",
+ 				       isprint((int)p[i]) ? p[i] : '.');
+ 		}
+-		fprintf(fp, "%08x: %-48s %-16s\n",
++		fprintf(fp, "%08zu: %-48s %-16s\n",
+ 			of, hexen, charen);
+ 	}
+ }
+Index: b/src/rdlog.c
+===================================================================
+--- a/src/rdlog.c
++++ b/src/rdlog.c
+@@ -38,7 +38,7 @@
+ 
+ void rd_hexdump (FILE *fp, const char *name, const void *ptr, size_t len) {
+ 	const char *p = (const char *)ptr;
+-	int of = 0;
++	size_t of = 0;
+ 
+ 
+ 	if (name)
+@@ -47,17 +47,17 @@ void rd_hexdump (FILE *fp, const char *n
+ 	for (of = 0 ; of < len ; of += 16) {
+ 		char hexen[16*3+1];
+ 		char charen[16+1];
+-		int hof = 0;
++		size_t hof = 0;
+ 
+-		int cof = 0;
+-		int i;
++		size_t cof = 0;
++		size_t i;
+ 
+ 		for (i = of ; i < of + 16 && i < len ; i++) {
+ 			hof += sprintf(hexen+hof, "%02x ", p[i] & 0xff);
+ 			cof += sprintf(charen+cof, "%c",
+ 				       isprint((int)p[i]) ? p[i] : '.');
+ 		}
+-		fprintf(fp, "%08x: %-48s %-16s\n",
++		fprintf(fp, "%08zu: %-48s %-16s\n",
+ 			of, hexen, charen);
+ 	}
+ }
diff -Nru librdkafka-0.8.6/debian/patches/series librdkafka-0.8.6/debian/patches/series
--- librdkafka-0.8.6/debian/patches/series	2015-07-19 06:41:21.000000000 +0800
+++ librdkafka-0.8.6/debian/patches/series	2015-12-21 21:41:51.000000000 +0800
@@ -1 +1,2 @@
 0001-mklove-update-add-disable-silent-rules.patch
+0002_hexdump_use_size_t_instead_of_int.diff