diff --git a/scripts/build.sh b/scripts/build.sh
index a116823..68e44fd 100644
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -35,22 +35,28 @@ echo "Building from: $REPO_DIR"
 # ── 1. Install build dependencies ───────────────────────────────────────────
 echo "Installing build dependencies..."
 if command -v apt-get > /dev/null 2>&1; then
+  # Enable arm64 packages alongside x86_64 (Debian multiarch)
+  dpkg --add-architecture arm64
   apt-get update -y
+
+  # Cross-compiler toolchain (host)
   DEBIAN_FRONTEND=noninteractive apt-get install -y \
-    git curl wget unzip build-essential \
+    git curl wget unzip build-essential pkg-config \
     gcc-aarch64-linux-gnu g++-aarch64-linux-gnu \
-    binutils-aarch64-linux-gnu \
-    libmpg123-dev libsndfile1-dev libopenal-dev libassimp-dev \
-    libglew-dev libglfw3-dev liburiparser-dev \
-    libcurl4-openssl-dev libpugixml-dev libasound2-dev \
-    libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev \
-    gstreamer1.0-plugins-good gstreamer1.0-plugins-bad \
-    gstreamer1.0-plugins-ugly gstreamer1.0-libav \
-    libgtk-3-dev libboost-filesystem-dev \
-    libfontconfig1-dev libfreetype-dev libx11-dev \
-    libxrandr-dev libxinerama-dev libxcursor-dev libxi-dev \
-    libpulse-dev libudev-dev libfreeimage-dev librtaudio-dev \
-    freeglut3-dev libxxf86vm-dev
+    binutils-aarch64-linux-gnu
+
+  # aarch64 dev libraries (provides the .pc files pkg-config needs)
+  DEBIAN_FRONTEND=noninteractive apt-get install -y \
+    libmpg123-dev:arm64 libsndfile1-dev:arm64 libopenal-dev:arm64 libassimp-dev:arm64 \
+    libglew-dev:arm64 libglfw3-dev:arm64 liburiparser-dev:arm64 \
+    libcurl4-openssl-dev:arm64 libpugixml-dev:arm64 libasound2-dev:arm64 \
+    libgstreamer1.0-dev:arm64 libgstreamer-plugins-base1.0-dev:arm64 \
+    libgtk-3-dev:arm64 libboost-filesystem-dev:arm64 \
+    libfontconfig1-dev:arm64 libfreetype-dev:arm64 libx11-dev:arm64 \
+    libxrandr-dev:arm64 libxinerama-dev:arm64 libxcursor-dev:arm64 libxi-dev:arm64 \
+    libpulse-dev:arm64 libudev-dev:arm64 libfreeimage-dev:arm64 \
+    freeglut3-dev:arm64 libxxf86vm-dev:arm64 \
+    libcairo2-dev:arm64 libzmq3-dev:arm64
 fi
 
 # Install Node.js if missing
@@ -147,6 +153,9 @@ fi
 
 cd "$ADDON_DIR/example_basic"
 GLOBAL_FLAGS="-Wno-error -Wno-reorder -Wno-sign-compare -Wno-delete-non-virtual-dtor -std=c++11 -O0 -fno-tree-vrp"
+# Point pkg-config to the aarch64 .pc files installed by the :arm64 packages
+export PKG_CONFIG_PATH="/usr/lib/aarch64-linux-gnu/pkgconfig:/usr/share/pkgconfig"
+export PKG_CONFIG_LIBDIR="/usr/lib/aarch64-linux-gnu/pkgconfig:/usr/share/pkgconfig"
 make clean 2>/dev/null || true
 make -j1 \
   PLATFORM_ARCH=aarch64 \