diff --git a/.gitignore b/.gitignore
index 84788ec..846c395 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,5 @@
 /out
 /dist
 /tmp
+/ondk-*
 /*.zip
diff --git a/build.sh b/build.sh
index 93f80bc..359aa22 100755
--- a/build.sh
+++ b/build.sh
@@ -5,32 +5,40 @@
 
 set -e
 
-if [ -z $1 ]; then
-  echo "Usage: $0 <arch>"
-  echo "<arch> is either x86_64 or aarch64"
-  echo
-  exit 1
-fi
-
 . common.sh
 
 OS=$(uname | tr '[:upper:]' '[:lower:]')
-ARCH="$1"
+NATIVE_ARCH=$(uname -m)
+if [ $NATIVE_ARCH = "arm64" ]; then
+  # Apple calls aarch64 arm64
+  NATIVE_ARCH='aarch64'
+fi
+
+if [ -z $1 ]; then
+  # Build the native architecture by default
+  ARCH=$NATIVE_ARCH
+else
+  ARCH=$1
+fi
 
 if [ $OS = "darwin" ]; then
   NDK_DIRNAME='darwin-x86_64'
   TRIPLE="${ARCH}-apple-darwin"
+  NATIVE_TRIPLE="${NATIVE_ARCH}-apple-darwin"
   DYN_EXT='dylib'
 
   if [ $ARCH = "aarch64" ]; then
-    # Configure jemalloc to use 16k pages for Apple Silicon
+    # Apple Silicon uses 16k pages
     export JEMALLOC_SYS_WITH_LG_PAGE=14
+  else
+    export JEMALLOC_SYS_WITH_LG_PAGE=12
   fi
 
   command -v ninja >/dev/null || brew install ninja
 else
   NDK_DIRNAME='linux-x86_64'
   TRIPLE="${ARCH}-unknown-linux-gnu"
+  NATIVE_TRIPLE="${NATIVE_ARCH}-unknown-linux-gnu"
   DYN_EXT='so'
 
   command -v ninja >/dev/null || sudo apt-get install ninja-build
@@ -41,11 +49,7 @@ build() {
   python3 ./x.py --config "../config-${OS}.toml" --host $TRIPLE install
   cd ../
 
-  if [ $OS = "darwin" -a $ARCH = "aarch64" ]; then
-    RUST_CLANG=$(rust/build/x86_64-apple-darwin/llvm/bin/llvm-config --version)
-  else
-    RUST_CLANG=$(rust/build/$TRIPLE/llvm/bin/llvm-config --version)
-  fi
+  RUST_CLANG=$(rust/build/$NATIVE_TRIPLE/llvm/bin/llvm-config --version)
 
   cd out
   cp -af ../rust/build/$TRIPLE/llvm/bin llvm-bin
@@ -113,7 +117,7 @@ universal() {
 
 clone
 
-if [ $OS = "darwin" -a $ARCH = "aarch64" ]; then
+if [ -n "$GITHUB_ACTION" -a $OS = "darwin" -a $ARCH = "aarch64" ]; then
   if [ ! -f tmp/stage-1.tar.gz ]; then
     echo '! Missing stage 1 artifacts'
     exit 1
@@ -129,7 +133,7 @@ fi
 
 build
 
-if [ $OS = "darwin" ]; then
+if [ -n "$GITHUB_ACTION" -a $OS = "darwin" ]; then
   if [ $ARCH = "x86_64" ]; then
     # Pack up first stage artifacts
     mkdir tmp
diff --git a/clean.sh b/clean.sh
new file mode 100755
index 0000000..16e8215
--- /dev/null
+++ b/clean.sh
@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+# Copyright 2022 Google LLC.
+# SPDX-License-Identifier: Apache-2.0
+
+set -e
+
+rm -rf rust out out.arm out.x86 android-ndk-*.zip ndk ondk-* dist
diff --git a/common.sh b/common.sh
index a970497..286a3cd 100644
--- a/common.sh
+++ b/common.sh
@@ -1,9 +1,9 @@
 # Copyright 2022 Google LLC.
 # SPDX-License-Identifier: Apache-2.0
 
-RUST_VERSION='3830ecaa8db798d2727cbdfa4ddf314ff938f268'
+RUST_VERSION='9c20b2a8cc7588decb6de25ac6a7912dcef24d65'
 NDK_VERSION='r25'
-OUTPUT_VERSION='r25.1'
+OUTPUT_VERSION='r25.2'
 
 NDK_CLANG='14.0.6'