Remove unecessary CFLAGS and fix CXXFLAGS
This code just uses C++ so CFLAGS is unecessary. Passing --std=c++11 to C compiler also has no effect.
The flags being passed to CPPFLAGS should be for CXXFLAFS instead.
This code just uses C++ so CFLAGS is unecessary. Passing --std=c++11 to C compiler also has no effect.
The flags being passed to CPPFLAGS should be for CXXFLAFS instead.