Makefile seems to ignore flags. Why?

It seems like make is ignoring my cflag options, as the compiler complains that I need to have -std=c++11 as a flag, but that option is included in my makefile.

CC=g++
# Flags for the C compiler
CC_FLAGS= \
    -Wall \
    -std=c++11 \
    -O2
# Linker Flags
LD_FLAGS= 

# Sources to compile
SOURCES=main.cpp
OBJECTS=$(SOURCES:.cpp=.o)
EXE=HolidayLights.out

all: $(SOURCES) $(EXE)

# Primary build target
$(EXE): $(OBJECTS)
    $(CC) $(LD_FLAGS) $(OBJECTS) -o $@

.o:
    $(CC) -c $(CC_FLAGS) -o $@ $<

The output of the build commands of this makefile are:

g++     -c -o main.o main.cpp

I don't understand why it's not listing my flags in the output. Also, I know for a fact that it is ignoring -std=c++11 flag as it complains about non-static constant member, and it shouldn't with that flag enabled.