Create install.sh 

#if [ ! -f lib/third_party/zlib-1.2.5/libz.a ]
#then
#	echo "installing zLib"
#	(cd lib/third_party/zlib-1.2.5; ./configure --prefix=build_dir --libdir=build_dir --includedir=build_dir; make; make install; cd ..; ln -fs zlib-1.2.5/build_dir zlib)
#fi