Relevant bit from config.log:

xgcc (GCC) 4.7.3
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

configure:3355: $? = 0
configure:3344: 
/Users/vbraun/Sage/local/var/tmp/sage/build/gcc-4.7.3.p1/gcc-build/./gcc/xgcc 
-B/Users/vbraun/Sage/local/var/tmp/sage/build/gcc-4.7.3.p1/gcc-build/./gcc/ 
-B/Users/vbraun/Sage/local/x86_64-apple-darwin14.0.0/bin/ 
-B/Users/vbraun/Sage/local/x86_64-apple-darwin14.0.0/lib/ -isystem 
/Users/vbraun/Sage/local/x86_64-apple-darwin14.0.0/include -isystem 
/Users/vbraun/Sage/local/x86_64-apple-darwin14.0.0/sys-include    -v >&5
Reading specs from 
/Users/vbraun/Sage/local/var/tmp/sage/build/gcc-4.7.3.p1/gcc-build/./gcc/specs
COLLECT_GCC=/Users/vbraun/Sage/local/var/tmp/sage/build/gcc-4.7.3.p1/gcc-build/./gcc/xgcc
COLLECT_LTO_WRAPPER=/Users/vbraun/Sage/local/var/tmp/sage/build/gcc-4.7.3.p1/gcc-build/./gcc/lto-wrapper
Target: x86_64-apple-darwin14.0.0
Configured with: ../src/configure --prefix=/Users/vbraun/Sage/local 
--with-local-prefix=/Users/vbraun/Sage/local 
--with-gmp=/Users/vbraun/Sage/local --with-mpfr=/Users/vbraun/Sage/local 
--with-mpc=/Users/vbraun/Sage/local --with-system-zlib --disable-multilib 
--disable-nls  
Thread model: posix
gcc version 4.7.3 (GCC) 
configure:3355: $? = 0
configure:3344: 
/Users/vbraun/Sage/local/var/tmp/sage/build/gcc-4.7.3.p1/gcc-build/./gcc/xgcc 
-B/Users/vbraun/Sage/local/var/tmp/sage/build/gcc-4.7.3.p1/gcc-build/./gcc/ 
-B/Users/vbraun/Sage/local/x86_64-apple-darwin14.0.0/bin/ 
-B/Users/vbraun/Sage/local/x86_64-apple-darwin14.0.0/lib/ -isystem 
/Users/vbraun/Sage/local/x86_64-apple-darwin14.0.0/include -isystem 
/Users/vbraun/Sage/local/x86_64-apple-darwin14.0.0/sys-include    -V >&5
xgcc: error: unrecognized command line option '-V'
xgcc: fatal error: no input files
compilation terminated.
configure:3355: $? = 1
configure:3344: 
/Users/vbraun/Sage/local/var/tmp/sage/build/gcc-4.7.3.p1/gcc-build/./gcc/xgcc 
-B/Users/vbraun/Sage/local/var/tmp/sage/build/gcc-4.7.3.p1/gcc-build/./gcc/ 
-B/Users/vbraun/Sage/local/x86_64-apple-darwin14.0.0/bin/ 
-B/Users/vbraun/Sage/local/x86_64-apple-darwin14.0.0/lib/ -isystem 
/Users/vbraun/Sage/local/x86_64-apple-darwin14.0.0/include -isystem 
/Users/vbraun/Sage/local/x86_64-apple-darwin14.0.0/sys-include    -qversion 
>&5
xgcc: error: unrecognized command line option '-qversion'
xgcc: fatal error: no input files
compilation terminated.
configure:3355: $? = 1
configure:3371: 
/Users/vbraun/Sage/local/var/tmp/sage/build/gcc-4.7.3.p1/gcc-build/./gcc/xgcc 
-B/Users/vbraun/Sage/local/var/tmp/sage/build/gcc-4.7.3.p1/gcc-build/./gcc/ 
-B/Users/vbraun/Sage/local/x86_64-apple-darwin14.0.0/bin/ 
-B/Users/vbraun/Sage/local/x86_64-apple-darwin14.0.0/lib/ -isystem 
/Users/vbraun/Sage/local/x86_64-apple-darwin14.0.0/include -isystem 
/Users/vbraun/Sage/local/x86_64-apple-darwin14.0.0/sys-include    -o 
conftest -g -O2   conftest.c  >&5
conftest.c:1:0: error: unknown value '10.10' of -mmacosx-version-min
configure:3374: $? = 1
configure:3562: checking for suffix of object files
configure:3584: 
/Users/vbraun/Sage/local/var/tmp/sage/build/gcc-4.7.3.p1/gcc-build/./gcc/xgcc 
-B/Users/vbraun/Sage/local/var/tmp/sage/build/gcc-4.7.3.p1/gcc-build/./gcc/ 
-B/Users/vbraun/Sage/local/x86_64-apple-darwin14.0.0/bin/ 
-B/Users/vbraun/Sage/local/x86_64-apple-darwin14.0.0/lib/ -isystem 
/Users/vbraun/Sage/local/x86_64-apple-darwin14.0.0/include -isystem 
/Users/vbraun/Sage/local/x86_64-apple-darwin14.0.0/sys-include    -c -g -O2 
 conftest.c >&5
conftest.c:1:0: error: unknown value '10.10' of -mmacosx-version-min
configure:3588: $? = 1
configure: failed program was:
| /* confdefs.h */
| #define PACKAGE_NAME "GNU C Runtime Library"
| #define PACKAGE_TARNAME "libgcc"
| #define PACKAGE_VERSION "1.0"
| #define PACKAGE_STRING "GNU C Runtime Library 1.0"
| #define PACKAGE_BUGREPORT ""
| #define PACKAGE_URL "http://www.gnu.org/software/libgcc/";
| /* end confdefs.h.  */
| 
| int
| main ()
| {
| 
|   ;
|   return 0;
| }
configure:3602: error: in 
`/Users/vbraun/Sage/local/var/tmp/sage/build/gcc-4.7.3.p1/gcc-build/x86_64-apple-darwin14.0.0/libgcc':
configure:3605: error: cannot compute suffix of object files: cannot compile
See `config.log' for more details.

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