AC_ARG_WITH([system_zlib],
[ --without-system-zlib Don't use installed zlib library],,[with_system_zlib=yes])
AC_ARG_WITH([zlib_libdir],
[ --with-zlib-libdir=DIR Specify directory where the zlib library resides.])
AC_ARG_WITH([zlib_include],
[ --with-zlib-include=DIR Specify the zlib header files location.])