Problem installing SageMath in a MAC OS 10.11

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I tried to install SageMath on my Mac but I've been not able. The install.log is the following. Any suggestions how to fix the problem?

*** ALL ENVIRONMENT VARIABLES BEFORE BUILD: ***
Apple_PubSub_Socket_Render=/private/tmp/com.apple.launchd.lVkhkEeHUb/Render
DISPLAY=/private/tmp/com.apple.launchd.EQE2TENF0c/org.macosforge.xquartz:0
HOME=/Users/Beebee
LANG=en_US.UTF-8
LOGNAME=Beebee
MAKE=make
MAKEFLAGS=
MAKELEVEL=1
MFLAGS=
PATH=/Users/Beebee/Downloads/SageMath/build/bin:/Users/Beebee/Downloads/SageMath/src/bin:/Users/Beebee/Downloads/SageMath/local/bin:/opt/local/bin:/opt/local/sbin:/Library/Frameworks/Python.framework/Versions/3.4/bin:/Library/Frameworks/Python.framework/Versions/Current/bin:/Library/Frameworks/Python.framework/Versions/3.2/bin:/opt/local/bin:/opt/local/sbin:/opt/local/bin:/opt/local/sbin:/opt/local/bin:/opt/local/sbin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/opt/X11/bin:/Library/TeX/texbin
PWD=/Users/Beebee/Downloads/SageMath/build/make
PYTHONPATH=/Users/Beebee/Downloads/SageMath/local
SAGE_EXTCODE=/Users/Beebee/Downloads/SageMath/local/share/sage/ext
SAGE_LOCAL=/Users/Beebee/Downloads/SageMath/local
SAGE_LOGS=/Users/Beebee/Downloads/SageMath/logs/pkgs
SAGE_ORIG_PATH=/opt/local/bin:/opt/local/sbin:/Library/Frameworks/Python.framework/Versions/3.4/bin:/Library/Frameworks/Python.framework/Versions/Current/bin:/Library/Frameworks/Python.framework/Versions/3.2/bin:/opt/local/bin:/opt/local/sbin:/opt/local/bin:/opt/local/sbin:/opt/local/bin:/opt/local/sbin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/opt/X11/bin:/Library/TeX/texbin
SAGE_ORIG_PATH_SET=True
SAGE_ROOT=/Users/Beebee/Downloads/SageMath
SAGE_SHARE=/Users/Beebee/Downloads/SageMath/local/share
SAGE_SPKG_INST=/Users/Beebee/Downloads/SageMath/local/var/lib/sage/installed
SAGE_SRC=/Users/Beebee/Downloads/SageMath/src
SAGE_VERSION=7.1
SECURITYSESSIONID=186a6
SHELL=/bin/bash
SHLVL=4
SSH_AUTH_SOCK=/private/tmp/com.apple.launchd.Ew8hsTGnj3/Listeners
TERM=xterm-256color
TERM_PROGRAM=Apple_Terminal
TERM_PROGRAM_VERSION=361.1
TERM_SESSION_ID=C282CC30-020E-476B-8C1A-848A7B995B2B
TMPDIR=/var/folders/_6/0pq5yd_55ndd9bzsp1v7znq80000gn/T/
USER=Beebee
XPC_FLAGS=0x0
XPC_SERVICE_NAME=0
_=/usr/bin/env
__CF_USER_TEXT_ENCODING=0x1F5:0x0:0x0
***********************************************
make base
sage-logger 'sage-spkg patch-2.7.5' '/Users/Beebee/Downloads/SageMath/logs/pkgs/patch-2.7.5.log'
Found local metadata for patch-2.7.5
/Users/Beebee/Downloads/SageMath/build/bin/../sage_bootstrap/cmdline.py:78: Warning: 'as' will become a reserved keyword in Python 2.6
Traceback (most recent call last):
  File "/Users/Beebee/Downloads/SageMath/build/bin/sage-download-file", line 27, in <module>
    from sage_bootstrap.cmdline import SageDownloadFileApplication
  File "/Users/Beebee/Downloads/SageMath/build/bin/../sage_bootstrap/cmdline.py", line 78
    except TypeError as err:
                      ^
SyntaxError: invalid syntax
make[2]: *** [/Users/Beebee/Downloads/SageMath/local/var/lib/sage/installed/patch-2.7.5] Error 1
make[1]: *** [all-toolchain] Error 2

real    0m0.180s
user    0m0.087s
sys 0m0.086s
***************************************************************
Error building Sage.

The following package(s) may have failed to build (not necessarily
during this run of 'make all'):

The build directory may contain configuration files and other potentially
helpful information. WARNING: if you now run 'make' again, the build
directory will, by default, be deleted. Set the environment variable
SAGE_KEEP_BUILT_SPKGS to 'yes' to prevent this.