pip install cffi --upgrade
Collecting cffi
  Using cached cffi-1.1.0.tar.gz
Requirement already up-to-date: pycparser in /usr/local/lib/python2.7/site-packages (from cffi)
Building wheels for collected packages: cffi
  Running setup.py bdist_wheel for cffi
  Complete output from command /usr/local/bin/python -c "import setuptools;__file__='/tmp/pip-build-pkmx_K/cffi/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" bdist_wheel -d /tmp/tmpk372mTpip-wheel-:
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build/lib.freebsd-10.1-RELEASE-p9-amd64-2.7
  creating build/lib.freebsd-10.1-RELEASE-p9-amd64-2.7/cffi
  copying cffi/gc_weakref.py -> build/lib.freebsd-10.1-RELEASE-p9-amd64-2.7/cffi
  copying cffi/recompiler.py -> build/lib.freebsd-10.1-RELEASE-p9-amd64-2.7/cffi
  copying cffi/verifier.py -> build/lib.freebsd-10.1-RELEASE-p9-amd64-2.7/cffi
  copying cffi/backend_ctypes.py -> build/lib.freebsd-10.1-RELEASE-p9-amd64-2.7/cffi
  copying cffi/api.py -> build/lib.freebsd-10.1-RELEASE-p9-amd64-2.7/cffi
  copying cffi/ffiplatform.py -> build/lib.freebsd-10.1-RELEASE-p9-amd64-2.7/cffi
  copying cffi/cparser.py -> build/lib.freebsd-10.1-RELEASE-p9-amd64-2.7/cffi
  copying cffi/vengine_cpy.py -> build/lib.freebsd-10.1-RELEASE-p9-amd64-2.7/cffi
  copying cffi/lock.py -> build/lib.freebsd-10.1-RELEASE-p9-amd64-2.7/cffi
  copying cffi/cffi_opcode.py -> build/lib.freebsd-10.1-RELEASE-p9-amd64-2.7/cffi
  copying cffi/setuptools_ext.py -> build/lib.freebsd-10.1-RELEASE-p9-amd64-2.7/cffi
  copying cffi/vengine_gen.py -> build/lib.freebsd-10.1-RELEASE-p9-amd64-2.7/cffi
  copying cffi/model.py -> build/lib.freebsd-10.1-RELEASE-p9-amd64-2.7/cffi
  copying cffi/__init__.py -> build/lib.freebsd-10.1-RELEASE-p9-amd64-2.7/cffi
  copying cffi/commontypes.py -> build/lib.freebsd-10.1-RELEASE-p9-amd64-2.7/cffi
  copying cffi/_cffi_include.h -> build/lib.freebsd-10.1-RELEASE-p9-amd64-2.7/cffi
  copying cffi/parse_c_type.h -> build/lib.freebsd-10.1-RELEASE-p9-amd64-2.7/cffi
  running build_ext
  building '_cffi_backend' extension
  creating build/temp.freebsd-10.1-RELEASE-p9-amd64-2.7
  creating build/temp.freebsd-10.1-RELEASE-p9-amd64-2.7/c
  cc -fno-strict-aliasing -O2 -pipe -fstack-protector -fno-strict-aliasing -DNDEBUG -fPIC -DUSE__THREAD -I/usr/include/ffi -I/usr/include/libffi -I/usr/local/include -I/usr/local/include/python2.7 -c c/_cffi_backend.c -o build/temp.freebsd-10.1-RELEASE-p9-amd64-2.7/c/_cffi_backend.o
  In file included from /usr/local/lib/gcc5/gcc/x86_64-portbld-freebsd10.1/5.1.0/include-fixed/syslimits.h:7:0,
                   from /usr/local/lib/gcc5/gcc/x86_64-portbld-freebsd10.1/5.1.0/include-fixed/limits.h:34,
                   from /usr/local/include/python2.7/Python.h:19,
                   from c/_cffi_backend.c:2:
  /usr/local/lib/gcc5/gcc/x86_64-portbld-freebsd10.1/5.1.0/include-fixed/limits.h:168:61: fatal error: limits.h: No such file or directory
  compilation terminated.
  error: command 'cc' failed with exit status 1

  ----------------------------------------
  Failed building wheel for cffi
Failed to build cffi
Installing collected packages: cffi
  Found existing installation: cffi 0.8.6
    Uninstalling cffi-0.8.6:
      Successfully uninstalled cffi-0.8.6
  Running setup.py install for cffi
    Complete output from command /usr/local/bin/python -c "import setuptools, tokenize;__file__='/tmp/pip-build-pkmx_K/cffi/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-z43ihW-record/install-record.txt --single-version-externally-managed --compile:
    running install
    running build
    running build_py
    running build_ext
    building '_cffi_backend' extension
    cc -fno-strict-aliasing -O2 -pipe -fstack-protector -fno-strict-aliasing -DNDEBUG -fPIC -DUSE__THREAD -I/usr/include/ffi -I/usr/include/libffi -I/usr/local/include -I/usr/local/include/python2.7 -c c/_cffi_backend.c -o build/temp.freebsd-10.1-RELEASE-p9-amd64-2.7/c/_cffi_backend.o
    In file included from /usr/local/lib/gcc5/gcc/x86_64-portbld-freebsd10.1/5.1.0/include-fixed/syslimits.h:7:0,
                     from /usr/local/lib/gcc5/gcc/x86_64-portbld-freebsd10.1/5.1.0/include-fixed/limits.h:34,
                     from /usr/local/include/python2.7/Python.h:19,
                     from c/_cffi_backend.c:2:
    /usr/local/lib/gcc5/gcc/x86_64-portbld-freebsd10.1/5.1.0/include-fixed/limits.h:168:61: fatal error: limits.h: No such file or directory
    compilation terminated.
    error: command 'cc' failed with exit status 1

    ----------------------------------------
  Rolling back uninstall of cffi
Command "/usr/local/bin/python -c "import setuptools, tokenize;__file__='/tmp/pip-build-pkmx_K/cffi/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-z43ihW-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-pkmx_K/cffi