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当我尝试在Ubuntu上安装libsass到Python 3.5 virtualenv时，出现无法构建轮子的错误，但安装似乎仍然成功。我该如何a）让轮子成功建立，这样我就可以将它缓存为新的virtualenvs，或b）使它跳过似乎失败的编译thingie？即使安装libsass，为什么不能构建轮子？
这里的问题的样本再现：
(libsass_test)$ pip install libsass
Collecting libsass
Using cached libsass-0.9.3.tar.gz
Collecting six (from libsass)
Using cached six-1.10.0-py2.py3-none-any.whl
Building wheels for collected packages: libsass
Running setup.py bdist_wheel for libsass
Complete output from command /home/cjohnson/libsass_test/bin/python3.5 -c "import setuptools;__file__='/tmp/pip-build-k8_g3p3v/libsass/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" bdist_wheel -d /tmp/tmp4q_j26e6pip-wheel-:
running bdist_wheel
running build
running build_py
creating build
creating build/lib.linux-x86_64-3.5
copying sass.py -> build/lib.linux-x86_64-3.5
copying sassc.py -> build/lib.linux-x86_64-3.5
copying sasstests.py -> build/lib.linux-x86_64-3.5
creating build/lib.linux-x86_64-3.5/sassutils
copying sassutils/distutils.py -> build/lib.linux-x86_64-3.5/sassutils
copying sassutils/__init__.py -> build/lib.linux-x86_64-3.5/sassutils
copying sassutils/builder.py -> build/lib.linux-x86_64-3.5/sassutils
copying sassutils/wsgi.py -> build/lib.linux-x86_64-3.5/sassutils
running build_ext
building '_sass' extension
creating build/temp.linux-x86_64-3.5
creating build/temp.linux-x86_64-3.5/libsass
creating build/temp.linux-x86_64-3.5/libsass/src
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -g -fstack-protector-strong -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -fPIC -I./libsass/include -I/usr/include/python3.5m -I/home/cjohnson/libsass_test/include/python3.5m -c pysass.cpp -o build/temp.linux-x86_64-3.5/pysass.o -c -O3 -fPIC -std=c++0x -Wall -Wno-parentheses
cc1plus: warning: command line option ‘-Wstrict-prototypes’ is valid for C/ObjC but not for C++
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -g -fstack-protector-strong -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -fPIC -I./libsass/include -I/usr/include/python3.5m -I/home/cjohnson/libsass_test/include/python3.5m -c libsass/src/functions.cpp -o build/temp.linux-x86_64-3.5/libsass/src/functions.o -c -O3 -fPIC -std=c++0x -Wall -Wno-parentheses
剪断一些警告......我可以把全部的转储的要点，如果这将有助于。
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -g -fstack-protector-strong -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -fPIC -I./libsass/include -I/usr/include/python3.5m -I/home/cjohnson/libsass_test/include/python3.5m -c libsass/src/extend.cpp -o build/temp.linux-x86_64-3.5/libsass/src/extend.o -c -O3 -fPIC -std=c++0x -Wall -Wno-parentheses
cc1plus: warning: command line option ‘-Wstrict-prototypes’ is valid for C/ObjC but not for C++
x86_64-linux-gnu-g++ -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-Bsymbolic-functions -Wl,-z,relro -g -fstack-protector-strong -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 build/temp.linux-x86_64-3.5/pysass.o build/temp.linux-x86_64-3.5/libsass/src/functions.o build/temp.linux-x86_64-3.5/libsass/src/plugins.o build/temp.linux-x86_64-3.5/libsass/src/error_handling.o build/temp.linux-x86_64-3.5/libsass/src/node.o build/temp.linux-x86_64-3.5/libsass/src/source_map.o build/temp.linux-x86_64-3.5/libsass/src/remove_placeholders.o build/temp.linux-x86_64-3.5/libsass/src/constants.o build/temp.linux-x86_64-3.5/libsass/src/emitter.o build/temp.linux-x86_64-3.5/libsass/src/environment.o build/temp.linux-x86_64-3.5/libsass/src/utf8_string.o build/temp.linux-x86_64-3.5/libsass/src/inspect.o build/temp.linux-x86_64-3.5/libsass/src/file.o build/temp.linux-x86_64-3.5/libsass/src/sass_values.o build/temp.linux-x86_64-3.5/libsass/src/prelexer.o build/temp.linux-x86_64-3.5/libsass/src/to_value.o build/temp.linux-x86_64-3.5/libsass/src/cencode.o build/temp.linux-x86_64-3.5/libsass/src/listize.o build/temp.linux-x86_64-3.5/libsass/src/sass2scss.o build/temp.linux-x86_64-3.5/libsass/src/c99func.o build/temp.linux-x86_64-3.5/libsass/src/values.o build/temp.linux-x86_64-3.5/libsass/src/bind.o build/temp.linux-x86_64-3.5/libsass/src/to_string.o build/temp.linux-x86_64-3.5/libsass/src/context.o build/temp.linux-x86_64-3.5/libsass/src/eval.o build/temp.linux-x86_64-3.5/libsass/src/output.o build/temp.linux-x86_64-3.5/libsass/src/to_c.o build/temp.linux-x86_64-3.5/libsass/src/sass_functions.o build/temp.linux-x86_64-3.5/libsass/src/sass_util.o build/temp.linux-x86_64-3.5/libsass/src/parser.o build/temp.linux-x86_64-3.5/libsass/src/ast.o build/temp.linux-x86_64-3.5/libsass/src/memory_manager.o build/temp.linux-x86_64-3.5/libsass/src/json.o build/temp.linux-x86_64-3.5/libsass/src/util.o build/temp.linux-x86_64-3.5/libsass/src/lexer.o build/temp.linux-x86_64-3.5/libsass/src/position.o build/temp.linux-x86_64-3.5/libsass/src/cssize.o build/temp.linux-x86_64-3.5/libsass/src/units.o build/temp.linux-x86_64-3.5/libsass/src/sass_context.o build/temp.linux-x86_64-3.5/libsass/src/expand.o build/temp.linux-x86_64-3.5/libsass/src/sass_interface.o build/temp.linux-x86_64-3.5/libsass/src/sass.o build/temp.linux-x86_64-3.5/libsass/src/base64vlq.o build/temp.linux-x86_64-3.5/libsass/src/color_maps.o build/temp.linux-x86_64-3.5/libsass/src/extend.o -L./libsass/src -o build/lib.linux-x86_64-3.5/_sass.cpython-35m-x86_64-linux-gnu.so -fPIC -lstdc++
running build_scripts
creating build/scripts-3.5
copying and adjusting sassc.py -> build/scripts-3.5
changing mode of build/scripts-3.5/sassc.py from 664 to 775
installing to build/bdist.linux-x86_64/wheel
running install
running install_lib
creating build/bdist.linux-x86_64
creating build/bdist.linux-x86_64/wheel
copying build/lib.linux-x86_64-3.5/sassc.py -> build/bdist.linux-x86_64/wheel
creating build/bdist.linux-x86_64/wheel/sassutils
copying build/lib.linux-x86_64-3.5/sassutils/distutils.py -> build/bdist.linux-x86_64/wheel/sassutils
copying build/lib.linux-x86_64-3.5/sassutils/__init__.py -> build/bdist.linux-x86_64/wheel/sassutils
copying build/lib.linux-x86_64-3.5/sassutils/builder.py -> build/bdist.linux-x86_64/wheel/sassutils
copying build/lib.linux-x86_64-3.5/sassutils/wsgi.py -> build/bdist.linux-x86_64/wheel/sassutils
copying build/lib.linux-x86_64-3.5/_sass.cpython-35m-x86_64-linux-gnu.so -> build/bdist.linux-x86_64/wheel
copying build/lib.linux-x86_64-3.5/sasstests.py -> build/bdist.linux-x86_64/wheel
copying build/lib.linux-x86_64-3.5/sass.py -> build/bdist.linux-x86_64/wheel
running install_egg_info
running egg_info
writing top-level names to libsass.egg-info/top_level.txt
writing libsass.egg-info/PKG-INFO
writing requirements to libsass.egg-info/requires.txt
writing dependency_links to libsass.egg-info/dependency_links.txt
writing entry points to libsass.egg-info/entry_points.txt
warning: manifest_maker: standard file '-c' not found
reading manifest file 'libsass.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'libsass.egg-info/SOURCES.txt'
Copying libsass.egg-info to build/bdist.linux-x86_64/wheel/libsass-0.9.3-py3.5.egg-info
running install_scripts
creating build/bdist.linux-x86_64/wheel/libsass-0.9.3.data
creating build/bdist.linux-x86_64/wheel/libsass-0.9.3.data/scripts
copying build/scripts-3.5/sassc.py -> build/bdist.linux-x86_64/wheel/libsass-0.9.3.data/scripts
changing mode of build/bdist.linux-x86_64/wheel/libsass-0.9.3.data/scripts/sassc.py to 775
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/tmp/pip-build-k8_g3p3v/libsass/setup.py", line 273, in <module>
cmdclass={'upload_doc': upload_doc}
File "/usr/lib/python3.5/distutils/core.py", line 148, in setup
dist.run_commands()
File "/usr/lib/python3.5/distutils/dist.py", line 955, in run_commands
self.run_command(cmd)
File "/usr/lib/python3.5/distutils/dist.py", line 974, in run_command
cmd_obj.run()
File "/home/cjohnson/libsass_test/lib/python3.5/site-packages/wheel/bdist_wheel.py", line 213, in run
archive_basename = self.get_archive_basename()
File "/home/cjohnson/libsass_test/lib/python3.5/site-packages/wheel/bdist_wheel.py", line 161, in get_archive_basename
impl_tag, abi_tag, plat_tag = self.get_tag()
File "/home/cjohnson/libsass_test/lib/python3.5/site-packages/wheel/bdist_wheel.py", line 155, in get_tag
assert tag == supported_tags[0]
AssertionError
----------------------------------------
Failed building wheel for libsass
Failed to build libsass
Installing collected packages: six, libsass
Running setup.py install for libsass
Successfully installed libsass-0.9.3 six-1.10.0