I am on Mac OS X 10.7.5, Intel Core i5.

I tried building the most recent version of sage from source (downloaded 
today), and I got an error: I think this is the relevant part:

g++  -I../../src/libcpp -I. -I../../src/libcpp/../include 
-I../../src/libcpp/include  -g  -W -Wall -Wno-narrowing -Wwrite-strings 
-Wmissing-format-attribute -pedantic -Wno-long-long  -fno-exceptions 
-fno-rtti -I../../src/libcpp -I. -I../../src/libcpp/../include 
-I../../src/libcpp/include   -c -o charset.o -MT charset.o -MMD -MP -MF 
.deps/charset.Tpo ../../src/libcpp/charset.c
cc1plus: error: unrecognized command line option "-Wno-narrowing"
make[6]: *** [charset.o] Error 1
make[5]: *** [all-stage1-libcpp] Error 2
make[4]: *** [stage1-bubble] Error 2
make[3]: *** [all] Error 2

real    1m11.092s
user    0m33.594s
sys    0m30.733s
************************************************************************
Error installing package gcc-4.9.2
************************************************************************

I checked in XCode and I do have Command Line Tools installed. Any ideas?

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