diff -Nru libitpp-4.3.1/debian/changelog libitpp-4.3.1/debian/changelog
--- libitpp-4.3.1/debian/changelog	2021-01-03 11:31:33.000000000 +0000
+++ libitpp-4.3.1/debian/changelog	2021-08-17 10:59:15.000000000 +0000
@@ -1,3 +1,10 @@
+libitpp (4.3.1-10) unstable; urgency=medium
+
+  * Acknowledge NMU. Thank you Holger Levsen.
+  * Add gpp11_fix.diff to handle FTBFS with g++-11. (Closes: #984113)
+
+ -- Kumar Appaiah <akumar@debian.org>  Tue, 17 Aug 2021 16:29:15 +0530
+
 libitpp (4.3.1-9.1) unstable; urgency=medium
 
   * Non maintainer upload by the Reproducible Builds team.
diff -Nru libitpp-4.3.1/debian/compat libitpp-4.3.1/debian/compat
--- libitpp-4.3.1/debian/compat	2016-11-11 15:14:24.000000000 +0000
+++ libitpp-4.3.1/debian/compat	2021-08-17 10:59:15.000000000 +0000
@@ -1 +1 @@
-9
+13
diff -Nru libitpp-4.3.1/debian/patches/gpp11_fix.diff libitpp-4.3.1/debian/patches/gpp11_fix.diff
--- libitpp-4.3.1/debian/patches/gpp11_fix.diff	1970-01-01 00:00:00.000000000 +0000
+++ libitpp-4.3.1/debian/patches/gpp11_fix.diff	2021-08-17 10:58:56.000000000 +0000
@@ -0,0 +1,44 @@
+Description: Explicit itpp::any call to handle g++-11 FTBFS
+Forwarded: not-needed
+Author: Kumar Appaiah <akumar@debian.org>
+
+Index: libitpp/gtests/vec_test.cpp
+===================================================================
+--- libitpp.orig/gtests/vec_test.cpp
++++ libitpp/gtests/vec_test.cpp
+@@ -276,13 +276,13 @@ void common_operators(const bvec &a, con
+ 
+   a2 = a;
+   a2.zeros();
+-  ASSERT_FALSE(any(a2));
++  ASSERT_FALSE(itpp::any(a2));
+   a2 = a;
+   a2.ones();
+   ASSERT_TRUE(all(a2));
+   a2 = a;
+   a2 = c;
+-  ASSERT_FALSE(any(a2));
++  ASSERT_FALSE(itpp::any(a2));
+   a2 = a;
+   a2 = b(0, 4);
+   ref = "0 0 0 1 1";
+@@ -1135,7 +1135,7 @@ TEST(Vec, All)
+   cvec cv2 = randn_c(10);
+   complex<double> cx = randn_c();
+   common_operators(cv1, cv2, cx);
+-  ASSERT_FALSE(any(cv1 == cx));
++  ASSERT_FALSE(itpp::any(cv1 == cx));
+   ASSERT_TRUE(all(cv1 != cx));
+ 
+ 
+@@ -1183,8 +1183,8 @@ TEST(Vec, All)
+   bvec b2 = "0 0 0 0 0 0 0 0 0 0";
+   bvec b3 = "1 1 1 1 1 1 1 1 1 1 1 1 1";
+   bvec b4 = "1 1 1 1 1 1 1 1 1 1 1 0 1";
+-  ASSERT_TRUE(any(b1));
+-  ASSERT_FALSE(any(b2));
++  ASSERT_TRUE(itpp::any(b1));
++  ASSERT_FALSE(itpp::any(b2));
+   ASSERT_TRUE(all(b3));
+   ASSERT_FALSE(all(b4));
+ }
diff -Nru libitpp-4.3.1/debian/patches/series libitpp-4.3.1/debian/patches/series
--- libitpp-4.3.1/debian/patches/series	2018-06-21 16:06:18.000000000 +0000
+++ libitpp-4.3.1/debian/patches/series	2021-08-17 10:59:15.000000000 +0000
@@ -3,3 +3,4 @@
 itpp-pc-fix.diff
 delete-sflogo.diff
 honour-SOURCE_DATE_EPOCH.diff
+gpp11_fix.diff