check for deps

AndroidCompat/getAndroid.sh

@@ -8,6 +8,17 @@
 
 # This is a bash script to create android.jar stubs
 
+for dep in "curl" "base64" "zip"
+do
+  which $dep >/dev/null 2>&1 || { echo >&2 "Error: This script needs $dep installed."; abort=yes; }
+done
+
+if [ $abort = yes ]; then
+  echo "Some of the dependencies didn't exist. Aborting."
+  exit 1
+fi
+
+
 # foolproof against running from AndroidCompat dir instead of running from project root
 if [ "$(basename $(pwd))" = "AndroidCompat" ]; then
   cd ..