diff --git a/templates/build-mac.sh b/templates/build-mac.sh
new file mode 100644
index 0000000..a313881
--- /dev/null
+++ b/templates/build-mac.sh
@@ -0,0 +1,53 @@
+#!/bin/bash
+
+set -e
+
+usage() {
+  echo "usage: ${0##*/} extension_id [chromium|google-chrome]"
+  exit 1
+}
+
+EXT_ID=$1
+BROWSER=$2
+
+DIR="$( cd "$( dirname "$0" )" && pwd )"
+
+if [ "$BROWSER" = "" ] ; then
+  BROWSER="chromium"
+fi
+
+if [ "$BROWSER" != "chromium" -a "$BROWSER" != "google-chrome" ] ; then
+  usage
+fi
+
+if [ "$EXT_ID" = "" ]; then
+  usage
+fi
+
+if [ "$TARGET_DIR" = "" ] ; then
+  TARGET_DIR="$HOME/.config/$BROWSER/NativeMessagingHosts"
+fi
+
+if [ "$HOST_PATH" = "" ] ; then
+  HOST_PATH=$(realpath "$DIR/../host")
+fi
+
+# Create directory to store native messaging host.
+mkdir -p "$TARGET_DIR"
+
+# Copy native messaging host manifest.
+JSON="com.leoiannacone.goopg.json"
+cp "$DIR/$JSON.in" "$TARGET_DIR/$JSON"
+
+# Update host path in the manifest.
+HOST_PATH="$HOST_PATH/chrome-main.py"
+sed -i '' "s|@HOST_PATH@|$HOST_PATH|" "$TARGET_DIR/$JSON"
+sed -i '' "s|@EXT_ID@|$EXT_ID|" "$TARGET_DIR/$JSON"
+
+# Set permissions for the manifest so that all users can read it.
+chmod o+r "$TARGET_DIR/$JSON"
+
+echo Native messaging host $JSON has been installed. "$TARGET_DIR/$JSON"
+# make the goopg-web-extension-id
+JS=goopg-web-extension-id.js
+sed "s|@EXT_ID@|$EXT_ID|" "$DIR/$JS.in" > "$DIR/../app/$JS"