First, find the missing file:
find /usr -name c++config.h
(Headers are in /usr, most of the time.) Then, add its top dir to the include path of your compilation command, so the compiler will find "bits/c++config.h", using the -I option. A similar question was already asked on SO, BTW: Missing include "bits/c++config.h" when cross compiling 64 bit program on 32 bit in Ubuntu.