diff --git a/build-aux/m4/bitcoin_qt.m4 b/build-aux/m4/bitcoin_qt.m4
index e9470e76..a8fc75ef 100644
--- a/build-aux/m4/bitcoin_qt.m4
+++ b/build-aux/m4/bitcoin_qt.m4
@@ -433,7 +433,15 @@ AC_DEFUN([_BITCOIN_QT_FIND_STATIC_PLUGINS],[
        if test "x$TARGET_OS" = xlinux; then
          QT_LIBS="-lQt6XcbQpa -lQt6InputSupport -lQt6FbSupport -lQt6DeviceDiscoverySupport $QT_LIBS"
          if test "x$PKG_CONFIG" != x; then
-           QT6_XCB_LIBS=`PKG_CONFIG_LIBDIR=/usr/lib/x86_64-linux-gnu/pkgconfig:/usr/share/pkgconfig $PKG_CONFIG --libs --static x11 x11-xcb xcb xcb-cursor xcb-icccm xcb-image xcb-keysyms xcb-randr xcb-renderutil xcb-shape xcb-shm xcb-sync xcb-xfixes xcb-xkb xkbcommon xkbcommon-x11 fontconfig freetype2 harfbuzz 2>/dev/null`
+           qt_multiarch=`$CC -print-multiarch 2>/dev/null`
+           qt_system_pc_path="${QT_SYSTEM_PKG_CONFIG_LIBDIR}"
+           if test "x$qt_system_pc_path" = x && test "x$qt_multiarch" != x; then
+             qt_system_pc_path="/usr/lib/$qt_multiarch/pkgconfig:/lib/$qt_multiarch/pkgconfig:/usr/lib/pkgconfig:/usr/share/pkgconfig"
+           fi
+           if test "x$qt_system_pc_path" = x; then
+             qt_system_pc_path="/usr/lib/pkgconfig:/usr/share/pkgconfig"
+           fi
+           QT6_XCB_LIBS=`PKG_CONFIG_LIBDIR="$qt_system_pc_path" $PKG_CONFIG --libs --static x11 x11-xcb xcb xcb-cursor xcb-icccm xcb-image xcb-keysyms xcb-randr xcb-render xcb-renderutil xcb-shape xcb-shm xcb-sync xcb-xfixes xcb-xkb xkbcommon xkbcommon-x11 fontconfig freetype2 harfbuzz 2>/dev/null`
            QT_LIBS="$QT_LIBS $QT6_XCB_LIBS"
          fi
        fi
diff --git a/contrib/agrarian-build-menu.sh b/contrib/agrarian-build-menu.sh
index 4ebe72bc..aea9a13c 100755
--- a/contrib/agrarian-build-menu.sh
+++ b/contrib/agrarian-build-menu.sh
@@ -215,12 +215,15 @@ install_packages() {
     linux-qt)
       packages+=(
         xvfb
-        libfontconfig1-dev libfreetype6-dev
+        libfontconfig1-dev libfreetype6-dev libharfbuzz-dev
+        libbrotli-dev libbz2-dev libexpat1-dev libglib2.0-dev
+        libgraphite2-dev libpng-dev zlib1g-dev
         libx11-xcb-dev libxcb1-dev libxcb-cursor-dev libxcb-image0-dev
         libxcb-icccm4-dev libxcb-keysyms1-dev libxcb-randr0-dev
         libxcb-render0-dev libxcb-render-util0-dev libxcb-shape0-dev
         libxcb-shm0-dev libxcb-sync-dev libxcb-util-dev libxcb-xfixes0-dev
-        libxcb-xinerama0-dev libxcb-xkb-dev libxi-dev libxrender-dev
+        libxcb-xinerama0-dev libxcb-xkb-dev libxau-dev libxdmcp-dev
+        libxext-dev libxi-dev libxrender-dev
         libxkbcommon-dev libxkbcommon-x11-dev
       )
       ;;
diff --git a/contrib/build-linux-wallet.sh b/contrib/build-linux-wallet.sh
index 4806f250..83cef8fb 100755
--- a/contrib/build-linux-wallet.sh
+++ b/contrib/build-linux-wallet.sh
@@ -3,10 +3,10 @@ set -euo pipefail
 
 ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 JOBS="${JOBS:-1}"
-HOST="${HOST:-x86_64-pc-linux-gnu}"
+BUILD_HOST="${BUILD_HOST:-$("$ROOT/depends/config.guess")}"
+HOST="${HOST:-$BUILD_HOST}"
 PREFIX="$ROOT/depends/$HOST"
 BASE_CONFIG="$PREFIX/share/config.site"
-BUILD_HOST="${BUILD_HOST:-$("$ROOT/depends/config.guess")}"
 NATIVE_BIN="$ROOT/depends/build/$BUILD_HOST/bin"
 PROTOC="$NATIVE_BIN/protoc"
 
@@ -32,6 +32,68 @@ reset_qt_configure_state() {
   rm -rf "$qt_work"
 }
 
+detect_system_pkg_config_libdir() {
+  local dirs=()
+  local multiarch pc_path dir
+
+  if command -v dpkg-architecture >/dev/null 2>&1; then
+    multiarch="$(dpkg-architecture -qDEB_HOST_MULTIARCH 2>/dev/null || true)"
+    [[ -n "$multiarch" ]] && dirs+=("/usr/lib/$multiarch/pkgconfig" "/lib/$multiarch/pkgconfig")
+  fi
+
+  multiarch="$(gcc -print-multiarch 2>/dev/null || true)"
+  [[ -n "$multiarch" ]] && dirs+=("/usr/lib/$multiarch/pkgconfig" "/lib/$multiarch/pkgconfig")
+
+  IFS=: read -r -a pc_path <<<"$(pkg-config --variable pc_path pkg-config 2>/dev/null || true)"
+  dirs+=("${pc_path[@]}" /usr/lib/pkgconfig /usr/share/pkgconfig)
+
+  local unique=()
+  for dir in "${dirs[@]}"; do
+    [[ -n "$dir" && -d "$dir" ]] || continue
+    case ":${unique[*]}:" in
+      *":$dir:"*) ;;
+      *) unique+=("$dir") ;;
+    esac
+  done
+
+  (IFS=:; echo "${unique[*]}")
+}
+
+preflight_linux_qt_deps() {
+  local missing=()
+  local modules=(
+    x11 x11-xcb xcb xcb-cursor xcb-icccm xcb-image xcb-keysyms
+    xcb-randr xcb-render xcb-renderutil xcb-shape xcb-shm xcb-sync
+    xcb-xfixes xcb-xkb xkbcommon xkbcommon-x11 fontconfig freetype2
+    harfbuzz zlib libpng libbrotlidec libbrotlicommon expat glib-2.0
+    graphite2
+  )
+  local module
+
+  export QT_SYSTEM_PKG_CONFIG_LIBDIR="${QT_SYSTEM_PKG_CONFIG_LIBDIR:-$(detect_system_pkg_config_libdir)}"
+
+  for module in "${modules[@]}"; do
+    if ! PKG_CONFIG_LIBDIR="$QT_SYSTEM_PKG_CONFIG_LIBDIR" pkg-config --exists "$module"; then
+      missing+=("$module")
+    fi
+  done
+
+  if ((${#missing[@]})); then
+    cat >&2 <<EOF
+Missing Linux Qt/XCB development pkg-config modules:
+  ${missing[*]}
+
+Install the Ubuntu packages from contrib/agrarian-build-menu.sh, then rerun.
+For a direct build on Ubuntu 24.04, start with:
+  sudo apt-get install libfontconfig1-dev libfreetype6-dev libharfbuzz-dev libbrotli-dev libbz2-dev libexpat1-dev libglib2.0-dev libgraphite2-dev libpng-dev zlib1g-dev libx11-xcb-dev libxcb1-dev libxcb-cursor-dev libxcb-icccm4-dev libxcb-image0-dev libxcb-keysyms1-dev libxcb-randr0-dev libxcb-render0-dev libxcb-render-util0-dev libxcb-shape0-dev libxcb-shm0-dev libxcb-sync-dev libxcb-util-dev libxcb-xfixes0-dev libxcb-xinerama0-dev libxcb-xkb-dev libxau-dev libxdmcp-dev libxext-dev libxi-dev libxrender-dev libxkbcommon-dev libxkbcommon-x11-dev
+EOF
+    exit 1
+  fi
+
+  echo "Using system pkg-config path for Qt/XCB:"
+  echo "  $QT_SYSTEM_PKG_CONFIG_LIBDIR"
+}
+
 ensure_native_protoc() {
   local archive found
 
@@ -89,6 +151,13 @@ require_cmd g++
 require_cmd cmake
 require_cmd ninja
 
+if [[ "$HOST" == "$BUILD_HOST" ]]; then
+  preflight_linux_qt_deps
+else
+  echo "Linux Qt wallet build expects a native HOST. Got HOST=$HOST BUILD_HOST=$BUILD_HOST" >&2
+  exit 1
+fi
+
 reset_qt_configure_state
 remove_invalid_native_protobuf_cache
 
@@ -106,7 +175,7 @@ if [[ build-aux/m4/bitcoin_qt.m4 -nt configure || build-aux/m4/bitcoin_qt.m4 -nt
 fi
 
 echo "Configuring Ubuntu Qt6 wallet build..."
-CONFIG_SITE="$BASE_CONFIG" ./configure \
+QT_SYSTEM_PKG_CONFIG_LIBDIR="$QT_SYSTEM_PKG_CONFIG_LIBDIR" CONFIG_SITE="$BASE_CONFIG" ./configure \
   --disable-maintainer-mode \
   --disable-tests \
   --disable-bench \
@@ -114,6 +183,9 @@ CONFIG_SITE="$BASE_CONFIG" ./configure \
   --with-qtdbus=no \
   --with-protoc-bindir="$NATIVE_BIN"
 
+echo "Cleaning stale target objects before compiling..."
+make clean
+
 echo "Building Ubuntu Qt wallet with JOBS=$JOBS..."
 make -j"$JOBS"
 
diff --git a/depends/hosts/aarch64-linux-gnu.mk b/depends/hosts/aarch64-linux-gnu.mk
new file mode 100644
index 00000000..4e0c3bc1
--- /dev/null
+++ b/depends/hosts/aarch64-linux-gnu.mk
@@ -0,0 +1,2 @@
+# aarch64 Linux native build alias.
+include hosts/aarch64-unknown-linux-gnu.mk
diff --git a/depends/hosts/aarch64-unknown-linux-gnu.mk b/depends/hosts/aarch64-unknown-linux-gnu.mk
new file mode 100644
index 00000000..dcdd119d
--- /dev/null
+++ b/depends/hosts/aarch64-unknown-linux-gnu.mk
@@ -0,0 +1,13 @@
+# aarch64 Linux native build (Ubuntu 22.04/24.04 arm64)
+host_arch := aarch64
+host_os   := linux
+
+host_prefix := $(BASEDIR)/$(HOST)
+build_prefix := $(BASEDIR)/build/$(BUILD)
+
+aarch64_linux_host   := $(HOST)
+aarch64_linux_prefix := $(host_prefix)
+aarch64_linux_id_string := $(HOST)
+
+include hosts/default.mk
+include hosts/linux.mk
diff --git a/depends/packages/qt.mk b/depends/packages/qt.mk
index 9a79df37..98c78bb7 100644
--- a/depends/packages/qt.mk
+++ b/depends/packages/qt.mk
@@ -46,6 +46,7 @@ $(package)_config_opts_linux  = -fontconfig
 $(package)_config_opts_linux += -qpa xcb
 $(package)_config_opts_linux += -xcb
 $(package)_config_opts_linux += -xkbcommon
+$(package)_config_opts_linux += -feature-xkbcommon-x11
 $(package)_config_opts_linux += -system-freetype
 $(package)_config_opts_linux += -no-feature-sessionmanager
 $(package)_config_opts_mingw32 = -qpa windows
@@ -84,8 +85,17 @@ define $(package)_extract_cmds
 endef
 
 define $(package)_config_cmds
+    qt_system_pc="$$$${QT_SYSTEM_PKG_CONFIG_LIBDIR:-`unset PKG_CONFIG_LIBDIR PKG_CONFIG_PATH; pkg-config --variable pc_path pkg-config 2>/dev/null || true`}" && \
+    if test -z "$$$${qt_system_pc}"; then \
+      qt_multiarch="`gcc -print-multiarch 2>/dev/null || true`"; \
+      if test -n "$$$${qt_multiarch}"; then \
+        qt_system_pc="/usr/lib/$$$${qt_multiarch}/pkgconfig:/lib/$$$${qt_multiarch}/pkgconfig:/usr/lib/pkgconfig:/usr/share/pkgconfig"; \
+      else \
+        qt_system_pc="/usr/lib/pkgconfig:/usr/share/pkgconfig"; \
+      fi; \
+    fi && \
     export PKG_CONFIG_SYSROOT_DIR=/ && \
-    export PKG_CONFIG_LIBDIR=$(host_prefix)/lib/pkgconfig$(if $(filter linux,$(host_os)),:/usr/lib/x86_64-linux-gnu/pkgconfig:/usr/share/pkgconfig) && \
+    export PKG_CONFIG_LIBDIR=$(host_prefix)/lib/pkgconfig$(if $(filter linux,$(host_os)),:$$$${qt_system_pc}) && \
     export PKG_CONFIG_PATH=$(host_prefix)/share/pkgconfig && \
   ../qtbase/configure $($(package)_config_opts) -- -G Ninja $($(package)_cmake_opts) $($(package)_cmake_opts_$(host_os)) $($(package)_cmake_opts_$(host_arch)_$(host_os))
 endef