diff -Nru ableton-link-3.1.0+dfsg/.appveyor.yml ableton-link-3.1.1+dfsg/.appveyor.yml
--- ableton-link-3.1.0+dfsg/.appveyor.yml	2023-09-19 13:46:28.000000000 +0000
+++ ableton-link-3.1.1+dfsg/.appveyor.yml	2024-02-01 14:19:51.000000000 +0000
@@ -119,6 +119,7 @@
         - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
         - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2022
     build_script:
+      - py -3 -m pip install setuptools
       - py -3 ci/configure.py --audio-driver %AUDIO_DRIVER% --thread-description %THREAD_DESCRIPTION% --generator "%GENERATOR%" --flags="-DCMAKE_SYSTEM_VERSION=10.0.18362.0"
       - py -3 ci/build.py --configuration %CONFIGURATION%
     test_script:
diff -Nru ableton-link-3.1.0+dfsg/debian/changelog ableton-link-3.1.1+dfsg/debian/changelog
--- ableton-link-3.1.0+dfsg/debian/changelog	2023-10-30 14:40:19.000000000 +0000
+++ ableton-link-3.1.1+dfsg/debian/changelog	2024-02-05 12:57:07.000000000 +0000
@@ -1,3 +1,9 @@
+ableton-link (3.1.1+dfsg-1) unstable; urgency=medium
+
+  * New upstream version 3.1.1+dfsg
+
+ -- IOhannes m zmölnig (Debian/GNU) <umlaeute@debian.org>  Mon, 05 Feb 2024 13:57:07 +0100
+
 ableton-link (3.1.0+dfsg-2) unstable; urgency=medium
 
   * Fix FTBFS with catch3 (Closes: #1054677)
diff -Nru ableton-link-3.1.0+dfsg/include/ableton/platforms/posix/ScanIpIfAddrs.hpp ableton-link-3.1.1+dfsg/include/ableton/platforms/posix/ScanIpIfAddrs.hpp
--- ableton-link-3.1.0+dfsg/include/ableton/platforms/posix/ScanIpIfAddrs.hpp	2023-09-19 13:46:28.000000000 +0000
+++ ableton-link-3.1.1+dfsg/include/ableton/platforms/posix/ScanIpIfAddrs.hpp	2024-02-01 14:19:51.000000000 +0000
@@ -86,12 +86,13 @@
       const struct ifaddrs* interface;
       for (interface = &interfaces; interface; interface = interface->ifa_next)
       {
-        auto addr = reinterpret_cast<const struct sockaddr_in*>(interface->ifa_addr);
+        const auto addr =
+          reinterpret_cast<const struct sockaddr_in*>(interface->ifa_addr);
         if (addr && interface->ifa_flags & IFF_RUNNING && addr->sin_family == AF_INET)
         {
-          auto bytes = reinterpret_cast<const char*>(&addr->sin_addr);
-          auto address = discovery::makeAddress<discovery::IpAddressV4>(bytes);
-          addrs.emplace_back(std::move(address));
+          const auto bytes = reinterpret_cast<const char*>(&addr->sin_addr);
+          const auto address = discovery::makeAddress<discovery::IpAddressV4>(bytes);
+          addrs.emplace_back(address);
           IpInterfaceNames.insert(std::make_pair(interface->ifa_name, address));
         }
       }
@@ -101,17 +102,19 @@
       const struct ifaddrs* interface;
       for (interface = &interfaces; interface; interface = interface->ifa_next)
       {
-        auto addr = reinterpret_cast<const struct sockaddr_in*>(interface->ifa_addr);
-        if (addr && interface->ifa_flags & IFF_RUNNING && addr->sin_family == AF_INET6)
+        const auto addr =
+          reinterpret_cast<const struct sockaddr_in*>(interface->ifa_addr);
+        if (IpInterfaceNames.find(interface->ifa_name) != IpInterfaceNames.end() && addr
+            && interface->ifa_flags & IFF_RUNNING && addr->sin_family == AF_INET6)
         {
-          auto addr6 = reinterpret_cast<const struct sockaddr_in6*>(addr);
-          auto bytes = reinterpret_cast<const char*>(&addr6->sin6_addr);
-          auto scopeId = addr6->sin6_scope_id;
-          auto address = discovery::makeAddress<discovery::IpAddressV6>(bytes, scopeId);
-          if (IpInterfaceNames.find(interface->ifa_name) != IpInterfaceNames.end()
-              && !address.is_loopback() && address.is_link_local())
+          const auto addr6 = reinterpret_cast<const struct sockaddr_in6*>(addr);
+          const auto bytes = reinterpret_cast<const char*>(&addr6->sin6_addr);
+          const auto scopeId = addr6->sin6_scope_id;
+          const auto address =
+            discovery::makeAddress<discovery::IpAddressV6>(bytes, scopeId);
+          if (!address.is_loopback() && address.is_link_local())
           {
-            addrs.emplace_back(std::move(address));
+            addrs.emplace_back(address);
           }
         }
       }
diff -Nru ableton-link-3.1.0+dfsg/include/ableton/platforms/windows/ScanIpIfAddrs.hpp ableton-link-3.1.1+dfsg/include/ableton/platforms/windows/ScanIpIfAddrs.hpp
--- ableton-link-3.1.0+dfsg/include/ableton/platforms/windows/ScanIpIfAddrs.hpp	2023-09-19 13:46:28.000000000 +0000
+++ ableton-link-3.1.1+dfsg/include/ableton/platforms/windows/ScanIpIfAddrs.hpp	2024-02-01 14:19:51.000000000 +0000
@@ -120,8 +120,9 @@
             // IPv4
             SOCKADDR_IN* addr4 =
               reinterpret_cast<SOCKADDR_IN*>(address->Address.lpSockaddr);
-            auto bytes = reinterpret_cast<const char*>(&addr4->sin_addr);
-            auto ipv4address = discovery::makeAddress<discovery::IpAddressV4>(bytes);
+            const auto bytes = reinterpret_cast<const char*>(&addr4->sin_addr);
+            const auto ipv4address =
+              discovery::makeAddress<discovery::IpAddressV4>(bytes);
             addrs.emplace_back(ipv4address);
             IpInterfaceNames.insert(
               std::make_pair(networkInterface->AdapterName, ipv4address));
@@ -145,8 +146,10 @@
           {
             SOCKADDR_IN6* sockAddr =
               reinterpret_cast<SOCKADDR_IN6*>(address->Address.lpSockaddr);
-            auto bytes = reinterpret_cast<const char*>(&sockAddr->sin6_addr);
-            auto addr6 = discovery::makeAddress<discovery::IpAddressV6>(bytes);
+            const auto scopeId = sockAddr->sin6_scope_id;
+            const auto bytes = reinterpret_cast<const char*>(&sockAddr->sin6_addr);
+            const auto addr6 =
+              discovery::makeAddress<discovery::IpAddressV6>(bytes, scopeId);
             if (!addr6.is_loopback() && addr6.is_link_local())
             {
               addrs.emplace_back(addr6);