shell script to automate downloading of OS X prebuilt dependencies

osx/download_dependencies.sh

@@ -0,0 +1,8 @@
+if [ -f ../.osx_dependencies_installed ];
+then
+   echo "OS X prebuilt dependencies are already installled"
+else
+	curl -o ../xcode-pack.zip -L https://dl.dropboxusercontent.com/u/1777581/xcode-pack.zip
+	unzip ../xcode-pack.zip -d ../
+	touch ../.osx_dependencies_installed
+fi