diff --git a/scripts/build_sdk.sh b/scripts/build_sdk.sh
index 1fb55e9..d98ecc5 100755
--- a/scripts/build_sdk.sh
+++ b/scripts/build_sdk.sh
@@ -26,7 +26,10 @@ repo=$(cd "$here/.." && pwd)
 eval "$("$here/detect_platform.sh")"
 
 SDK_REPO="${OB_SDK_REPO:-https://github.com/orbbec/OrbbecSDK_v2.git}"
-SDK_REF="${OB_SDK_REF:-main}"
+# Pinned to the version the recorder source is written against: v2.4.3 (which came
+# pre-placed on the Orin) lacks ob::Error::getStatus() that the recorder uses. A
+# caller can override for a platform that needs a different tag.
+SDK_REF="${OB_SDK_REF:-v2.8.6}"
 
 find_build() {
     local root="$1" b
@@ -100,11 +103,14 @@ inject_recorder "$root"
 cmake_k4a=()
 [[ -n "${K4A_WRAPPER_DIR:-}" ]] && cmake_k4a=(-DK4A_WRAPPER_DIR="$K4A_WRAPPER_DIR")
 
-build="$root/build/linux_$(uname -m)"
-mkdir -p "$build"
+# Build in $root/build and configure from there (cmake ..): the SDK's own
+# linux_config.cmake places its outputs in a build/linux_<arch> subdir itself.
+# Creating that subdir and configuring from inside it double-nests the outputs
+# (build/linux_aarch64/linux_arm64/lib), where find_build cannot see them.
+mkdir -p "$root/build"
 (
-    cd "$build"
-    cmake ../.. -DCMAKE_BUILD_TYPE=Release -DOB_BUILD_EXAMPLES=ON "${cmake_k4a[@]}" >&2
+    cd "$root/build"
+    cmake .. -DCMAKE_BUILD_TYPE=Release -DOB_BUILD_EXAMPLES=ON "${cmake_k4a[@]}" >&2
     make -j"$(nproc)" >&2
 )