cant emerge sympy from sage overlay

[elkhunter]

I'm running into the following error when trying to emerge sympy from the sage overlay. Any ideas? Note that I also have the science overlay installed in case that matters.

Thanks in advance.

* Package: dev-python/sympy-0.7.2-r3
* Repository: sage-on-gentoo
* Maintainer: grozin@gentoo.org sci-mathematics@gentoo.org
* USE: amd64 elibc_glibc gtk kernel_linux opengl pdf png python_targets_python2_7 userland_GNU
* FEATURES: preserve-libs userpriv usersandbox
>>> Unpacking source...
>>> Unpacking sympy-0.7.2.tar.gz to /var/tmp/portage/dev-python/sympy-0.7.2-r3/work/python2
>>> Source unpacked in /var/tmp/portage/dev-python/sympy-0.7.2-r3/work
>>> Preparing source in /var/tmp/portage/dev-python/sympy-0.7.2-r3/work ...
* Applying sympy-0.7.2-mpmath.patch ...
[ ok ]
* Applying sympy-0.7.2-mpmath-import.patch ...
[ ok ]
* Applying sympy-0.7.2-mpmath-test.patch ...
[ ok ]
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/dev-python/sympy-0.7.2-r3/work ...
>>> Source configured.
>>> Compiling source in /var/tmp/portage/dev-python/sympy-0.7.2-r3/work ...
* It seems that you need to set USE_PYTHON to make sure that legacy
* packages will be built with respect to PYTHON_TARGETS correctly:
*
* USE_PYTHON='2.7'
*
* Please note that after changing the USE_PYTHON variable, you may need
* to run 'python-updater' to rebuild affected packages.
*
* For more information on python.eclass compatibility, please see
* the appropriate python-r1 User's Guide chapter [1].
*
* [1] http://www.gentoo.org/proj/en/Python/python-r1/user-guide.xml#doc_chap2
* python2_7: running distutils-r1_run_phase python_compile
/usr/bin/python2.7 setup.py build --build-base /var/tmp/portage/dev-python/sympy-0.7.2-r3/work/build-python2_7 --build-platlib /var/tmp/portage/dev-python/sympy-0.7.2-r3/work/build-python2_7/lib --build-purelib /var/tmp/portage/dev-python/sympy-0.7.2-r3/work/build-python2_7/lib --build-scripts /var/tmp/portage/dev-python/sympy-0.7.2-r3/work/build-python2_7/scripts
Traceback (most recent call last):
File "setup.py", line 36, in <module>
import sympy
File "/var/tmp/portage/dev-python/sympy-0.7.2-r3/work/python2/sympy-0.7.2/sympy/__init__.py", line 49, in <module>
from sympy.core import *
File "/var/tmp/portage/dev-python/sympy-0.7.2-r3/work/python2/sympy-0.7.2/sympy/core/__init__.py", line 8, in <module>
from expr import Expr, AtomicExpr
File "/var/tmp/portage/dev-python/sympy-0.7.2-r3/work/python2/sympy-0.7.2/sympy/core/expr.py", line 5, in <module>
from evalf import EvalfMixin, pure_complex
File "/var/tmp/portage/dev-python/sympy-0.7.2-r3/work/python2/sympy-0.7.2/sympy/core/evalf.py", line 5, in <module>
import mpmath.libmp as libmp
File "/usr/lib64/python2.7/site-packages/mpmath/__init__.py", line 10, in <module>
mp = MPContext()
File "/usr/lib64/python2.7/site-packages/mpmath/ctx_mp.py", line 72, in __init__
ctx.init_builtins()
File "/usr/lib64/python2.7/site-packages/mpmath/ctx_mp.py", line 101, in init_builtins
ctx.one = ctx.make_mpf(fone)
File "ext_main.pyx", line 493, in sage.libs.mpmath.ext_main.Context.make_mpf (sage/libs/mpmath/ext_main.c:6669)
File "ext_main.pyx", line 503, in sage.libs.mpmath.ext_main.Context.make_mpf (sage/libs/mpmath/ext_main.c:6601)
File "ext_impl.pyx", line 268, in sage.libs.mpmath.ext_impl.MPF_set_tuple (sage/libs/mpmath/ext_impl.c:4102)
File "integer.pyx", line 754, in sage.rings.integer.Integer.__init__ (sage/rings/integer.c:7864)
TypeError: unable to coerce <type 'mpz'> to an integer
* ERROR: dev-python/sympy-0.7.2-r3::sage-on-gentoo failed (compile phase):
* (no error message)
*
* Call stack:
* ebuild.sh, line 93: Called src_compile
* environment, line 3561: Called distutils-r1_src_compile
* environment, line 996: Called _distutils-r1_run_foreach_impl 'python_compile'
* environment, line 314: Called python_parallel_foreach_impl 'distutils-r1_run_phase' 'python_compile'
* environment, line 3426: Called multibuild_parallel_foreach_variant '_python_multibuild_wrapper' 'distutils-r1_run_phase' 'python_compile'
* environment, line 2622: Called multibuild_foreach_variant '_multibuild_parallel' '_python_multibuild_wrapper' 'distutils-r1_run_phase' 'python_compile'
* environment, line 2570: Called _multibuild_run '_multibuild_parallel' '_python_multibuild_wrapper' 'distutils-r1_run_phase' 'python_compile'
* environment, line 2568: Called _multibuild_parallel '_python_multibuild_wrapper' 'distutils-r1_run_phase' 'python_compile'
* environment, line 2613: Called _python_multibuild_wrapper 'distutils-r1_run_phase' 'python_compile'
* environment, line 662: Called distutils-r1_run_phase 'python_compile'
* environment, line 987: Called python_compile
* environment, line 2999: Called distutils-r1_python_compile
* environment, line 889: Called esetup.py
* environment, line 1770: Called die
* The specific snippet of code:
* "${@}" || die
*
* If you need support, post the output of `emerge --info '=dev-python/sympy-0.7.2-r3::sage-on-gentoo'`,
* the complete build log and the output of `emerge -pqv '=dev-python/sympy-0.7.2-r3::sage-on-gentoo'`.
* The complete build log is located at '/var/tmp/portage/dev-python/sympy-0.7.2-r3/temp/build.log'.
* The ebuild environment file is located at '/var/tmp/portage/dev-python/sympy-0.7.2-r3/temp/environment'.
* Working directory: '/var/tmp/portage/dev-python/sympy-0.7.2-r3/work/python2/sympy-0.7.2'
* S: '/var/tmp/portage/dev-python/sympy-0.7.2-r3/work'