Build error in ps-lite when build from cxxnet

[biprajiman]

I posted same issue on cxxnet as well. I am not sure if this is issue related to ps-lite or cxxnet but the error definitely is when compiling ps-lite.

In file included from src/ps.h:13:0, from src/ps_main.cc:1: src/kv/kv_store_sparse.h:3:21: fatal error: dmlc/io.h: No such file or directory compilation terminated. make: *** [build/ps_main.o] Error 1