Thank you Mr. Agentzh. I have tried it couple times and it still fails. I am quite sure it is related to my compilation and configuration. Since I am still experimenting with Nginx overall, so I think I am ok with proxy-cache for now as it is sufficient enough for my set up. Once I am more comfortable with Nginx I will revisit your memc and srcache modules.
Much appreciate for all the great work you did for the Nginx development.
Sincerely,
-- Jin Kuang