diff --git a/veilid-flutter/rust/macos_build.sh b/veilid-flutter/rust/macos_build.sh
index 11efd509..26d96788 100755
--- a/veilid-flutter/rust/macos_build.sh
+++ b/veilid-flutter/rust/macos_build.sh
@@ -1,10 +1,18 @@
 #!/bin/bash
 
+# Setup varaiables
 SCRIPTDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+FLUTTER_DIR=$(dirname `which flutter`)
+HOMEBREW_DIR=$(dirname `which brew`)
+CARGO_DIR=$(dirname `which cargo`)
 CARGO_MANIFEST_PATH=$(python -c "import os; print(os.path.realpath(\"$SCRIPTDIR/Cargo.toml\"))")
 TARGET_DIR=$(dirname `cargo locate-project --message-format plain`)/target
-# echo CARGO_MANIFEST_PATH: $CARGO_MANIFEST_PATH 
 
+# Configure outputs
+OUTPUT_FILENAME=libveilid_flutter.dylib
+OUTPUT_DIR=$SCRIPTDIR/../macos/lib
+
+# Get Rust configurations from xcode configurations
 if [ "$CONFIGURATION" == "Debug" ]; then 
     EXTRA_CARGO_OPTIONS="$@"
     RUST_CONFIGURATION="debug"
@@ -12,8 +20,11 @@ else
     EXTRA_CARGO_OPTIONS="$@ --release"
     RUST_CONFIGURATION="release"
 fi
+
+# Build all the matching architectures for the xcode configurations
 ARCHS=${ARCHS:=x86_64}
 echo ARCHS: $ARCHS
+LIPO_LIST=""
 for arch in $ARCHS
 do
     if [ "$arch" == "arm64" ]; then
@@ -28,15 +39,14 @@ do
         echo Unsupported ARCH: $arch
         continue
     fi
-    FLUTTER_DIR=$(dirname `which flutter`)
-    HOMEBREW_DIR=$(dirname `which brew`)
-    CARGO_DIR=$(dirname `which cargo`)
+
+    # Cargo build
     env -i PATH=/usr/bin:/bin:/usr/local/bin:$HOMEBREW_DIR:$FLUTTER_DIR:$CARGO_DIR HOME="$HOME" USER="$USER" cargo $CARGO_TOOLCHAIN build $EXTRA_CARGO_OPTIONS --target $CARGO_TARGET --manifest-path $CARGO_MANIFEST_PATH
-    # xxx add to lipo list?
+
+    # Add output to lipo list
+    LIPO_LIST="$LIPO_LIST $TARGET_DIR/$CARGO_TARGET/$RUST_CONFIGURATION/$OUTPUT_FILENAME"
 done
 
-OUTPUT_DIR=$SCRIPTDIR/../macos/lib
+# Lipo the architectures together
 mkdir -p $OUTPUT_DIR
-# xxx use lipo library?
-cp $TARGET_DIR/x86_64-apple-darwin/$RUST_CONFIGURATION/libveilid_flutter.dylib $OUTPUT_DIR
-
+lipo -output "$OUTPUT_DIR/$OUTPUT_FILENAME" -create $LIPO_LIST