Makefile modification to support c++11

Question

I am able to compile a single file using gcc with -std=c++0x option. But I can't do this through makefile. Here are the set of flags in my makefile (which after make complains about c++11 keywords):

MACHINE = $(shell echo `uname -s`-`uname -m` | sed "s/ //g")
CCC     = CC
CCC     = g++
CFLAGS  = -O3
CFLAGS  = -std=c++0x
CFLAGS  = -pg -D_DEBUG -g -c -Wall
LFLAGS  = -O
LFLAGS  = -pg -g

What am I missing?

Edit: I changed it to the following, but I still get compile errors, which I don't get with command line gcc invocation.

CXXFLAGS=-O3 -std=c++0x -pg -D_DEBUG -g -c -Wall