diff --git a/.gitlab-ci.d/cirrus/freebsd-13.vars b/.gitlab-ci.d/cirrus/freebsd-13.vars
index 29ab964..69c948b 100644
--- a/.gitlab-ci.d/cirrus/freebsd-13.vars
+++ b/.gitlab-ci.d/cirrus/freebsd-13.vars
@@ -11,6 +11,6 @@
 NINJA='/usr/local/bin/ninja'
 PACKAGING_COMMAND='pkg'
 PIP3='/usr/local/bin/pip-3.8'
-PKGS='alsa-lib bash bison bzip2 ca_root_nss capstone4 ccache cmocka ctags curl cyrus-sasl dbus diffutils dtc flex fusefs-libs3 gettext git glib gmake gnutls gsed gtk3 json-c libepoxy libffi libgcrypt libjpeg-turbo libnfs libslirp libspice-server libssh libtasn1 llvm lzo2 meson mtools ncurses nettle ninja opencv pixman pkgconf png py311-numpy py311-pillow py311-pip py311-sphinx py311-sphinx_rtd_theme py311-tomli py311-yaml python3 rpm2cpio sdl2 sdl2_image snappy sndio socat spice-protocol tesseract usbredir virglrenderer vte3 xorriso zstd'
+PKGS='alsa-lib bash bison bzip2 ca_root_nss capstone4 ccache cmocka ctags curl cyrus-sasl dbus diffutils dtc flex fusefs-libs3 gettext git glib gmake gnutls gsed gtk-vnc gtk3 json-c libepoxy libffi libgcrypt libjpeg-turbo libnfs libslirp libspice-server libssh libtasn1 llvm lzo2 meson mtools ncurses nettle ninja opencv pixman pkgconf png py311-numpy py311-pillow py311-pip py311-sphinx py311-sphinx_rtd_theme py311-tomli py311-yaml python3 rpm2cpio sdl2 sdl2_image snappy sndio socat spice-protocol tesseract usbredir virglrenderer vte3 xorriso zstd'
 PYPI_PKGS=''
 PYTHON='/usr/local/bin/python3'
diff --git a/.gitlab-ci.d/cirrus/macos-13.vars b/.gitlab-ci.d/cirrus/macos-13.vars
index 534f029..ac3fa3a 100644
--- a/.gitlab-ci.d/cirrus/macos-13.vars
+++ b/.gitlab-ci.d/cirrus/macos-13.vars
@@ -11,6 +11,6 @@
 NINJA='/opt/homebrew/bin/ninja'
 PACKAGING_COMMAND='brew'
 PIP3='/opt/homebrew/bin/pip3'
-PKGS='bash bc bison bzip2 capstone ccache cmocka ctags curl dbus diffutils dtc flex gcovr gettext git glib gnu-sed gnutls gtk+3 jemalloc jpeg-turbo json-c libepoxy libffi libgcrypt libiscsi libnfs libpng libslirp libssh libtasn1 libusb llvm lzo make meson mtools ncurses nettle ninja pixman pkg-config python3 rpm2cpio sdl2 sdl2_image snappy socat sparse spice-protocol swtpm tesseract usbredir vde vte3 xorriso zlib zstd'
+PKGS='bash bc bison bzip2 capstone ccache cmocka ctags curl dbus diffutils dtc flex gcovr gettext git glib gnu-sed gnutls gtk+3 gtk-vnc jemalloc jpeg-turbo json-c libepoxy libffi libgcrypt libiscsi libnfs libpng libslirp libssh libtasn1 libusb llvm lzo make meson mtools ncurses nettle ninja pixman pkg-config python3 rpm2cpio sdl2 sdl2_image snappy socat sparse spice-protocol swtpm tesseract usbredir vde vte3 xorriso zlib zstd'
 PYPI_PKGS='PyYAML numpy pillow sphinx sphinx-rtd-theme tomli'
 PYTHON='/opt/homebrew/bin/python3'
diff --git a/.gitlab-ci.d/cirrus/macos-14.vars b/.gitlab-ci.d/cirrus/macos-14.vars
index 43070f4..24cfec3 100644
--- a/.gitlab-ci.d/cirrus/macos-14.vars
+++ b/.gitlab-ci.d/cirrus/macos-14.vars
@@ -11,6 +11,6 @@
 NINJA='/opt/homebrew/bin/ninja'
 PACKAGING_COMMAND='brew'
 PIP3='/opt/homebrew/bin/pip3'
-PKGS='bash bc bison bzip2 capstone ccache cmocka ctags curl dbus diffutils dtc flex gcovr gettext git glib gnu-sed gnutls gtk+3 jemalloc jpeg-turbo json-c libepoxy libffi libgcrypt libiscsi libnfs libpng libslirp libssh libtasn1 libusb llvm lzo make meson mtools ncurses nettle ninja pixman pkg-config python3 rpm2cpio sdl2 sdl2_image snappy socat sparse spice-protocol swtpm tesseract usbredir vde vte3 xorriso zlib zstd'
+PKGS='bash bc bison bzip2 capstone ccache cmocka ctags curl dbus diffutils dtc flex gcovr gettext git glib gnu-sed gnutls gtk+3 gtk-vnc jemalloc jpeg-turbo json-c libepoxy libffi libgcrypt libiscsi libnfs libpng libslirp libssh libtasn1 libusb llvm lzo make meson mtools ncurses nettle ninja pixman pkg-config python3 rpm2cpio sdl2 sdl2_image snappy socat sparse spice-protocol swtpm tesseract usbredir vde vte3 xorriso zlib zstd'
 PYPI_PKGS='PyYAML numpy pillow sphinx sphinx-rtd-theme tomli'
 PYTHON='/opt/homebrew/bin/python3'
diff --git a/meson.build b/meson.build
index 81ecd4b..fbda17c 100644
--- a/meson.build
+++ b/meson.build
@@ -315,6 +315,11 @@
   qemu_common_flags += '-D__EXTENSIONS__'
 elif host_os == 'haiku'
   qemu_common_flags += ['-DB_USE_POSITIVE_POSIX_ERRORS', '-D_BSD_SOURCE', '-fPIC']
+elif host_os == 'windows'
+  if not compiler.compiles('struct x { int y; } __attribute__((gcc_struct));',
+                           args: '-Werror')
+    error('Your compiler does not support __attribute__((gcc_struct)) - please use GCC instead of Clang')
+  endif
 endif
 
 # __sync_fetch_and_and requires at least -march=i486. Many toolchains
diff --git a/scripts/ci/setup/ubuntu/ubuntu-2204-aarch64.yaml b/scripts/ci/setup/ubuntu/ubuntu-2204-aarch64.yaml
index fd5489c..71a0f0c 100644
--- a/scripts/ci/setup/ubuntu/ubuntu-2204-aarch64.yaml
+++ b/scripts/ci/setup/ubuntu/ubuntu-2204-aarch64.yaml
@@ -49,6 +49,7 @@
   - libglusterfs-dev
   - libgnutls28-dev
   - libgtk-3-dev
+  - libgtk-vnc-2.0-dev
   - libibverbs-dev
   - libiscsi-dev
   - libjemalloc-dev
diff --git a/scripts/ci/setup/ubuntu/ubuntu-2204-s390x.yaml b/scripts/ci/setup/ubuntu/ubuntu-2204-s390x.yaml
index afa0450..d8de967 100644
--- a/scripts/ci/setup/ubuntu/ubuntu-2204-s390x.yaml
+++ b/scripts/ci/setup/ubuntu/ubuntu-2204-s390x.yaml
@@ -49,6 +49,7 @@
   - libglusterfs-dev
   - libgnutls28-dev
   - libgtk-3-dev
+  - libgtk-vnc-2.0-dev
   - libibverbs-dev
   - libiscsi-dev
   - libjemalloc-dev
diff --git a/target/s390x/tcg/translate.c b/target/s390x/tcg/translate.c
index c81e035..bcfff40 100644
--- a/target/s390x/tcg/translate.c
+++ b/target/s390x/tcg/translate.c
@@ -392,7 +392,6 @@
         return MMU_HOME_IDX;
     default:
         g_assert_not_reached();
-        break;
     }
 #endif
 }
diff --git a/tests/avocado/boot_linux_console.py b/tests/avocado/boot_linux_console.py
index 2929aa0..cffdd6b 100644
--- a/tests/avocado/boot_linux_console.py
+++ b/tests/avocado/boot_linux_console.py
@@ -1522,7 +1522,6 @@
     # like issues with a buggy kernel. As a result we don't want it
     # gating releases on Gitlab.
     @skipUnless(os.getenv('QEMU_TEST_FLAKY_TESTS'), 'Test is unstable on GitLab')
-
     def test_sh4_r2d(self):
         """
         :avocado: tags=arch:sh4
diff --git a/tests/avocado/intel_iommu.py b/tests/avocado/intel_iommu.py
index 008f214..992583f 100644
--- a/tests/avocado/intel_iommu.py
+++ b/tests/avocado/intel_iommu.py
@@ -13,7 +13,6 @@
 from avocado_qemu.linuxtest import LinuxTest
 
 @skipUnless(os.getenv('QEMU_TEST_FLAKY_TESTS'), 'Test is unstable on GitLab')
-
 class IntelIOMMU(LinuxTest):
     """
     :avocado: tags=arch:x86_64
diff --git a/tests/avocado/linux_initrd.py b/tests/avocado/linux_initrd.py
index aad5b19..7f47b98 100644
--- a/tests/avocado/linux_initrd.py
+++ b/tests/avocado/linux_initrd.py
@@ -54,7 +54,6 @@
             self.assertRegex(self.vm.get_log(), expected_msg)
 
     @skipUnless(os.getenv('QEMU_TEST_FLAKY_TESTS'), 'Test is unstable on GitLab')
-
     def test_with_2gib_file_should_work_with_linux_v4_16(self):
         """
         :avocado: tags=flaky
diff --git a/tests/avocado/machine_aspeed.py b/tests/avocado/machine_aspeed.py
index f8e263d..c0b01e8 100644
--- a/tests/avocado/machine_aspeed.py
+++ b/tests/avocado/machine_aspeed.py
@@ -323,7 +323,6 @@
         self.wait_for_console_pattern('Starting kernel ...')
 
     @skipUnless(os.getenv('QEMU_TEST_FLAKY_TESTS'), 'Test is unstable on GitLab')
-
     def test_arm_ast2500_evb_sdk(self):
         """
         :avocado: tags=arch:arm
@@ -343,7 +342,6 @@
         self.wait_for_console_pattern('nodistro.0 ast2500-default ttyS4')
 
     @skipUnless(os.getenv('QEMU_TEST_FLAKY_TESTS'), 'Test is unstable on GitLab')
-
     def test_arm_ast2600_evb_sdk(self):
         """
         :avocado: tags=arch:arm
diff --git a/tests/avocado/machine_mips_malta.py b/tests/avocado/machine_mips_malta.py
index 8cf84bd..07a8063 100644
--- a/tests/avocado/machine_mips_malta.py
+++ b/tests/avocado/machine_mips_malta.py
@@ -102,7 +102,6 @@
         self.do_test_i6400_framebuffer_logo(1)
 
     @skipUnless(os.getenv('QEMU_TEST_FLAKY_TESTS'), 'Test is unstable on GitLab')
-
     def test_mips_malta_i6400_framebuffer_logo_7cores(self):
         """
         :avocado: tags=arch:mips64el
@@ -114,7 +113,6 @@
         self.do_test_i6400_framebuffer_logo(7)
 
     @skipUnless(os.getenv('QEMU_TEST_FLAKY_TESTS'), 'Test is unstable on GitLab')
-
     def test_mips_malta_i6400_framebuffer_logo_8cores(self):
         """
         :avocado: tags=arch:mips64el
diff --git a/tests/avocado/machine_rx_gdbsim.py b/tests/avocado/machine_rx_gdbsim.py
index 412a7a5..9a0bec8 100644
--- a/tests/avocado/machine_rx_gdbsim.py
+++ b/tests/avocado/machine_rx_gdbsim.py
@@ -49,7 +49,6 @@
         #exec_command_and_wait_for_pattern(self, 'version', gcc_version)
 
     @skipUnless(os.getenv('QEMU_TEST_FLAKY_TESTS'), 'Test is unstable on GitLab')
-
     def test_linux_sash(self):
         """
         Boots a Linux kernel and checks that the console is operational.
diff --git a/tests/avocado/reverse_debugging.py b/tests/avocado/reverse_debugging.py
index 92855a0..f24287c 100644
--- a/tests/avocado/reverse_debugging.py
+++ b/tests/avocado/reverse_debugging.py
@@ -207,7 +207,6 @@
 
     # unidentified gitlab timeout problem
     @skipUnless(os.getenv('QEMU_TEST_FLAKY_TESTS'), 'Test is unstable on GitLab')
-
     def test_x86_64_pc(self):
         """
         :avocado: tags=arch:x86_64
@@ -225,7 +224,6 @@
 
     # unidentified gitlab timeout problem
     @skipUnless(os.getenv('QEMU_TEST_FLAKY_TESTS'), 'Test is unstable on GitLab')
-
     def test_aarch64_virt(self):
         """
         :avocado: tags=arch:aarch64
@@ -250,7 +248,6 @@
 
     # unidentified gitlab timeout problem
     @skipUnless(os.getenv('QEMU_TEST_FLAKY_TESTS'), 'Test is unstable on GitLab')
-
     def test_ppc64_pseries(self):
         """
         :avocado: tags=arch:ppc64
@@ -265,7 +262,6 @@
 
     # See https://gitlab.com/qemu-project/qemu/-/issues/1992
     @skipUnless(os.getenv('QEMU_TEST_FLAKY_TESTS'), 'Test is unstable on GitLab')
-
     def test_ppc64_powernv(self):
         """
         :avocado: tags=arch:ppc64
diff --git a/tests/avocado/smmu.py b/tests/avocado/smmu.py
index aadda71..83fd79e 100644
--- a/tests/avocado/smmu.py
+++ b/tests/avocado/smmu.py
@@ -14,7 +14,6 @@
 from avocado_qemu.linuxtest import LinuxTest
 
 @skipUnless(os.getenv('QEMU_TEST_FLAKY_TESTS'), 'Test is unstable on GitLab')
-
 class SMMU(LinuxTest):
     """
     :avocado: tags=accel:kvm
diff --git a/tests/docker/dockerfiles/alpine.docker b/tests/docker/dockerfiles/alpine.docker
index b079a83..54b9721 100644
--- a/tests/docker/dockerfiles/alpine.docker
+++ b/tests/docker/dockerfiles/alpine.docker
@@ -40,6 +40,7 @@
         glib-static \
         gnutls-dev \
         gtk+3.0-dev \
+        gtk-vnc-dev \
         json-c-dev \
         libaio-dev \
         libbpf-dev \
diff --git a/tests/docker/dockerfiles/debian-amd64-cross.docker b/tests/docker/dockerfiles/debian-amd64-cross.docker
index 8058695..136c3a7 100644
--- a/tests/docker/dockerfiles/debian-amd64-cross.docker
+++ b/tests/docker/dockerfiles/debian-amd64-cross.docker
@@ -30,6 +30,7 @@
                       git \
                       hostname \
                       libglib2.0-dev \
+                      libgtk-vnc-2.0-dev \
                       libpcre2-dev \
                       libsndio-dev \
                       libspice-protocol-dev \
diff --git a/tests/docker/dockerfiles/debian-arm64-cross.docker b/tests/docker/dockerfiles/debian-arm64-cross.docker
index 15457d7..233f6ee 100644
--- a/tests/docker/dockerfiles/debian-arm64-cross.docker
+++ b/tests/docker/dockerfiles/debian-arm64-cross.docker
@@ -30,6 +30,7 @@
                       git \
                       hostname \
                       libglib2.0-dev \
+                      libgtk-vnc-2.0-dev \
                       libpcre2-dev \
                       libsndio-dev \
                       libspice-protocol-dev \
diff --git a/tests/docker/dockerfiles/debian-armel-cross.docker b/tests/docker/dockerfiles/debian-armel-cross.docker
index c26ffc2..8476fc8 100644
--- a/tests/docker/dockerfiles/debian-armel-cross.docker
+++ b/tests/docker/dockerfiles/debian-armel-cross.docker
@@ -30,6 +30,7 @@
                       git \
                       hostname \
                       libglib2.0-dev \
+                      libgtk-vnc-2.0-dev \
                       libpcre2-dev \
                       libsndio-dev \
                       libspice-protocol-dev \
diff --git a/tests/docker/dockerfiles/debian-armhf-cross.docker b/tests/docker/dockerfiles/debian-armhf-cross.docker
index 8f87656..f26385e 100644
--- a/tests/docker/dockerfiles/debian-armhf-cross.docker
+++ b/tests/docker/dockerfiles/debian-armhf-cross.docker
@@ -30,6 +30,7 @@
                       git \
                       hostname \
                       libglib2.0-dev \
+                      libgtk-vnc-2.0-dev \
                       libpcre2-dev \
                       libsndio-dev \
                       libspice-protocol-dev \
diff --git a/tests/docker/dockerfiles/debian-i686-cross.docker b/tests/docker/dockerfiles/debian-i686-cross.docker
index f4ef054..3fe8ee6 100644
--- a/tests/docker/dockerfiles/debian-i686-cross.docker
+++ b/tests/docker/dockerfiles/debian-i686-cross.docker
@@ -30,6 +30,7 @@
                       git \
                       hostname \
                       libglib2.0-dev \
+                      libgtk-vnc-2.0-dev \
                       libpcre2-dev \
                       libsndio-dev \
                       libspice-protocol-dev \
diff --git a/tests/docker/dockerfiles/debian-mips64el-cross.docker b/tests/docker/dockerfiles/debian-mips64el-cross.docker
index 59c4c68..2862785 100644
--- a/tests/docker/dockerfiles/debian-mips64el-cross.docker
+++ b/tests/docker/dockerfiles/debian-mips64el-cross.docker
@@ -30,6 +30,7 @@
                       git \
                       hostname \
                       libglib2.0-dev \
+                      libgtk-vnc-2.0-dev \
                       libpcre2-dev \
                       libsndio-dev \
                       libspice-protocol-dev \
diff --git a/tests/docker/dockerfiles/debian-mipsel-cross.docker b/tests/docker/dockerfiles/debian-mipsel-cross.docker
index 880c774..0d559ae 100644
--- a/tests/docker/dockerfiles/debian-mipsel-cross.docker
+++ b/tests/docker/dockerfiles/debian-mipsel-cross.docker
@@ -30,6 +30,7 @@
                       git \
                       hostname \
                       libglib2.0-dev \
+                      libgtk-vnc-2.0-dev \
                       libpcre2-dev \
                       libsndio-dev \
                       libspice-protocol-dev \
diff --git a/tests/docker/dockerfiles/debian-ppc64el-cross.docker b/tests/docker/dockerfiles/debian-ppc64el-cross.docker
index 1d55b95..8c1dcec 100644
--- a/tests/docker/dockerfiles/debian-ppc64el-cross.docker
+++ b/tests/docker/dockerfiles/debian-ppc64el-cross.docker
@@ -30,6 +30,7 @@
                       git \
                       hostname \
                       libglib2.0-dev \
+                      libgtk-vnc-2.0-dev \
                       libpcre2-dev \
                       libsndio-dev \
                       libspice-protocol-dev \
diff --git a/tests/docker/dockerfiles/debian-s390x-cross.docker b/tests/docker/dockerfiles/debian-s390x-cross.docker
index 62ccda6..72668e0 100644
--- a/tests/docker/dockerfiles/debian-s390x-cross.docker
+++ b/tests/docker/dockerfiles/debian-s390x-cross.docker
@@ -30,6 +30,7 @@
                       git \
                       hostname \
                       libglib2.0-dev \
+                      libgtk-vnc-2.0-dev \
                       libpcre2-dev \
                       libsndio-dev \
                       libspice-protocol-dev \
diff --git a/tests/docker/dockerfiles/debian.docker b/tests/docker/dockerfiles/debian.docker
index 0d1d401..42bd0067 100644
--- a/tests/docker/dockerfiles/debian.docker
+++ b/tests/docker/dockerfiles/debian.docker
@@ -55,6 +55,7 @@
                       libglusterfs-dev \
                       libgnutls28-dev \
                       libgtk-3-dev \
+                      libgtk-vnc-2.0-dev \
                       libibverbs-dev \
                       libiscsi-dev \
                       libjemalloc-dev \
diff --git a/tests/docker/dockerfiles/fedora-win64-cross.docker b/tests/docker/dockerfiles/fedora-win64-cross.docker
index 007e157..6b264d9 100644
--- a/tests/docker/dockerfiles/fedora-win64-cross.docker
+++ b/tests/docker/dockerfiles/fedora-win64-cross.docker
@@ -34,6 +34,7 @@
                git \
                glib2-devel \
                glibc-langpack-en \
+               gtk-vnc2-devel \
                hostname \
                llvm \
                make \
diff --git a/tests/docker/dockerfiles/fedora.docker b/tests/docker/dockerfiles/fedora.docker
index 44f239c..ecdefaf 100644
--- a/tests/docker/dockerfiles/fedora.docker
+++ b/tests/docker/dockerfiles/fedora.docker
@@ -50,6 +50,7 @@
                glibc-static \
                glusterfs-api-devel \
                gnutls-devel \
+               gtk-vnc2-devel \
                gtk3-devel \
                hostname \
                jemalloc-devel \
diff --git a/tests/docker/dockerfiles/opensuse-leap.docker b/tests/docker/dockerfiles/opensuse-leap.docker
index 836f531..6614362 100644
--- a/tests/docker/dockerfiles/opensuse-leap.docker
+++ b/tests/docker/dockerfiles/opensuse-leap.docker
@@ -33,6 +33,7 @@
            glibc-locale \
            glibc-static \
            glusterfs-devel \
+           gtk-vnc-devel \
            gtk3-devel \
            hostname \
            jemalloc-devel \
diff --git a/tests/docker/dockerfiles/ubuntu2204.docker b/tests/docker/dockerfiles/ubuntu2204.docker
index beeb44f..3a7de6a 100644
--- a/tests/docker/dockerfiles/ubuntu2204.docker
+++ b/tests/docker/dockerfiles/ubuntu2204.docker
@@ -55,6 +55,7 @@
                       libglusterfs-dev \
                       libgnutls28-dev \
                       libgtk-3-dev \
+                      libgtk-vnc-2.0-dev \
                       libibverbs-dev \
                       libiscsi-dev \
                       libjemalloc-dev \
diff --git a/tests/lcitool/projects/qemu.yml b/tests/lcitool/projects/qemu.yml
index 0c85784..252e871 100644
--- a/tests/lcitool/projects/qemu.yml
+++ b/tests/lcitool/projects/qemu.yml
@@ -32,6 +32,7 @@
  - glusterfs
  - gnutls
  - gtk3
+ - gtk-vnc
  - hostname
  - json-c
  - libaio
diff --git a/tests/vm/generated/freebsd.json b/tests/vm/generated/freebsd.json
index 2a361ce..d5f0b62 100644
--- a/tests/vm/generated/freebsd.json
+++ b/tests/vm/generated/freebsd.json
@@ -29,6 +29,7 @@
     "gmake",
     "gnutls",
     "gsed",
+    "gtk-vnc",
     "gtk3",
     "json-c",
     "libepoxy",