I did a port install for gcc version 4.7.1 (MacPorts gcc47 4.7.1_2) I named the executable as g+ and placed it in one my $PATH. I use gcc 4.7.1 when I need c++11 standard. I haven't changed the original g++ so as not messup XCode.

I am using eclipse-cdt and running the make all from the window. It's giving me:

20:12:40 **** Build of configuration Default for project 2804-hw2 ****
make all 
g+ -c -Wall -std=c++11 main.cpp -o main.o
make: g+: No such file or directory
make: *** [main.o] Error 1
20:12:40 Build Finished (took 89ms)

Here is my makefile

CC=g+
CFLAGS=-c -Wall -std=c++11
LDFLAGS=
SOURCES=main.cpp Vector3D.cpp
OBJECTS=$(SOURCES:.cpp=.o)
EXECUTABLE=exec

all: $(SOURCES) $(EXECUTABLE)

$(EXECUTABLE): $(OBJECTS) 
    $(CC) $(LDFLAGS) $(OBJECTS) -o $@
.cpp.o:
    $(CC) $(CFLAGS) $< -o $@
 clean:
    rm $(EXECUTABLE) $(OBJECTS)

How do I make eclipse detect my g+?