$ brew install pip
    Error: No available formula with the name "pip"
    pip is part of the python formula:
      brew install python

    $ brew install python3
    Error: python 3.7.2_1 is already installed
    To upgrade to 3.7.2_2, run `brew upgrade python`

    $ /usr/local/Cellar/python/3.7.2_1/libexec/bin/pip install gevent==1.2.2
    Collecting gevent==1.2.2
      Using cached https://files.pythonhosted.org/packages/1b/92/b111f76e54d2be11375b47b213b56687214f258fd9dae703546d30b837be/gevent-1.2.2.tar.gz
    Requirement already satisfied: greenlet>=0.4.10 in /usr/local/lib/python3.7/site-packages (from gevent==1.2.2) (0.4.15)
    Building wheels for collected packages: gevent
      Running setup.py bdist_wheel for gevent ... error
      Complete output from command /usr/local/opt/python/bin/python3.7 -u -c "import setuptools, tokenize;__file__='/private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" bdist_wheel -d /private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-wheel-kfxv6brw --python-tag cp37:
      /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/distutils/dist.py:274: UserWarning: Unknown distribution option: 'cffi_modules'
        warnings.warn(msg)
      running bdist_wheel
      running build
      running build_py
      creating build
      creating build/lib.macosx-10.13-x86_64-3.7
      creating build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/queue.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/greenlet.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/backdoor.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/_semaphore.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/pywsgi.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/event.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/server.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/thread.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/_util_py2.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/signal.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/_ssl3.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/util.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/builtins.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/local.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/threadpool.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/subprocess.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/_socketcommon.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/timeout.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/os.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/__init__.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/core.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/_ssl2.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/fileobject.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/_fileobjectcommon.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/hub.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/_socket2.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/threading.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/win32util.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/resolver_ares.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/baseserver.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/_fileobjectposix.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/_util.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/lock.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/_sslgte279.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/_socket3.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/monkey.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/select.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/_compat.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/_threading.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/ssl.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/socket.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/pool.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/resolver_thread.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/wsgi.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/_tblib.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
      creating build/lib.macosx-10.13-x86_64-3.7/gevent/libev
      copying src/gevent/libev/_corecffi_build.py -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
      copying src/gevent/libev/__init__.py -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
      copying src/gevent/libev/corecffi.py -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
      running egg_info
      writing src/gevent.egg-info/PKG-INFO
      writing dependency_links to src/gevent.egg-info/dependency_links.txt
      writing requirements to src/gevent.egg-info/requires.txt
      writing top-level names to src/gevent.egg-info/top_level.txt
      reading manifest file 'src/gevent.egg-info/SOURCES.txt'
      reading manifest template 'MANIFEST.in'
      warning: no files found matching 'changelog.rst'
      warning: no files found matching 'known_failures.py'
      warning: no files found matching '.pep8'
      no previously-included directories found matching '*/__pycache__'
      warning: no previously-included files matching '*.so' found anywhere in distribution
      warning: no previously-included files matching '*.o' found anywhere in distribution
      warning: no previously-included files matching '*.lo' found anywhere in distribution
      warning: no previously-included files matching '*.la' found anywhere in distribution
      warning: no previously-included files matching 'config.log' found anywhere in distribution
      warning: no previously-included files matching 'config.status' found anywhere in distribution
      no previously-included directories found matching 'doc/_build'
      warning: no previously-included files matching '*.pyc' found anywhere in distribution
      warning: no previously-included files matching '.coverage' found under directory 'src/greentest'
      no previously-included directories found matching 'src/greentest/htmlcov'
      warning: no previously-included files matching 'stamp-h?' found under directory 'deps/c-ares'
      warning: no previously-included files matching 'ares_build.h.orig' found under directory 'deps/c-ares'
      no previously-included directories found matching 'deps/libev/.deps'
      warning: no previously-included files matching 'Makefile' found under directory 'deps/libev'
      warning: no previously-included files matching 'libtool' found under directory 'deps/libev'
      warning: no previously-included files matching 'stamp-h?' found under directory 'deps/libev'
      warning: no previously-included files matching 'config.h' found under directory 'deps/libev'
      warning: no previously-included files matching '_corecffi.c' found under directory 'src/gevent'
      warning: no previously-included files found matching 'Makefile'
      warning: no previously-included files found matching 'configure-output'
      writing manifest file 'src/gevent.egg-info/SOURCES.txt'
      copying src/gevent/_semaphore.pxd -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/ares.pyx -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/cares.pxd -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/cares_ntop.h -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/cares_pton.h -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/dnshelper.c -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/gevent._semaphore.c -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/gevent.ares.c -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/gevent.ares.h -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/python.pxd -> build/lib.macosx-10.13-x86_64-3.7/gevent
      copying src/gevent/libev/_corecffi_cdef.c -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
      copying src/gevent/libev/_corecffi_source.c -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
      copying src/gevent/libev/callbacks.c -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
      copying src/gevent/libev/callbacks.h -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
      copying src/gevent/libev/corecext.ppyx -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
      copying src/gevent/libev/corecext.pyx -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
      copying src/gevent/libev/gevent.corecext.c -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
      copying src/gevent/libev/libev.h -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
      copying src/gevent/libev/libev.pxd -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
      copying src/gevent/libev/libev_vfd.h -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
      copying src/gevent/libev/stathelper.c -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
      running build_ext
      Running '(cd  "/private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/deps/libev"  && sh ./configure   && cp config.h "$OLDPWD" ) > configure-output.txt' in /private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/build/temp.macosx-10.13-x86_64-3.7/libev
      building 'gevent.libev.corecext' extension
      creating build/temp.macosx-10.13-x86_64-3.7/src
      creating build/temp.macosx-10.13-x86_64-3.7/src/gevent
      creating build/temp.macosx-10.13-x86_64-3.7/src/gevent/libev
      clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -U__llvm__ -DLIBEV_EMBED=1 -DEV_COMMON= -DEV_CLEANUP_ENABLE=0 -DEV_EMBED_ENABLE=0 -DEV_PERIODIC_ENABLE=0 -Ibuild/temp.macosx-10.13-x86_64-3.7/libev -I/private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/deps/libev -I/usr/local/include -I/usr/local/opt/openssl/include -I/usr/local/opt/sqlite/include -I/usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m -c src/gevent/libev/gevent.corecext.c -o build/temp.macosx-10.13-x86_64-3.7/src/gevent/libev/gevent.corecext.o
      In file included from src/gevent/libev/gevent.corecext.c:434:
      In file included from src/gevent/libev/libev.h:2:
      /private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/deps/libev/ev.c:483:48: warning: '/*' within block comment [-Wcomment]
      /*#define MIN_INTERVAL  0.00000095367431640625 /* 1/2**20, good till 2200 */
                                                     ^
      /private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/deps/libev/ev.c:1269:13: warning: comparison of integers of different signs: 'unsigned int' and 'int' [-Wsign-compare]
            if (e < (14 - 24)) /* might not be sharp, but is good enough */
                ~ ^  ~~~~~~~
      /private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/deps/libev/ev.c:1831:31: warning: 'extern' variable has an initializer [-Wextern-initializer]
        EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
                                    ^
      /private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/deps/libev/ev.c:1940:19: warning: comparison of integers of different signs: 'int' and 'unsigned long' [-Wsign-compare]
        if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
            ~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      /private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/deps/libev/ev.c:3878:34: warning: '&' within '|' [-Wbitwise-op-parentheses]
        fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
                             ~~~~~~~~~~^~~~~~~~~~~~~ ~
      /private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/deps/libev/ev.c:3878:34: note: place parentheses around the '&' expression to silence this warning
        fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
                                       ^
                             (                      )
      src/gevent/libev/gevent.corecext.c:3314:104: warning: comparison of integers of different signs: 'unsigned int' and 'int' [-Wsign-compare]
        __pyx_t_1 = __pyx_f_6gevent_5libev_8corecext__flags_to_int(__pyx_v_flags, 0); if (unlikely(__pyx_t_1 == -1 && PyErr_Occurred())) __PYX_ERR(0, 168, __pyx_L1_error)
                                                                                                   ~~~~~~~~~ ^  ~~
      src/gevent/libev/gevent.corecext.c:614:43: note: expanded from macro 'unlikely'
        #define unlikely(x) __builtin_expect(!!(x), 0)
                                                ^
      src/gevent/libev/gevent.corecext.c:4092:106: warning: comparison of integers of different signs: 'unsigned int' and 'int' [-Wsign-compare]
          __pyx_t_2 = __pyx_f_6gevent_5libev_8corecext__flags_to_int(__pyx_v_flags, 0); if (unlikely(__pyx_t_2 == -1 && PyErr_Occurred())) __PYX_ERR(0, 267, __pyx_L1_error)
                                                                                                     ~~~~~~~~~ ^  ~~
      src/gevent/libev/gevent.corecext.c:614:43: note: expanded from macro 'unlikely'
        #define unlikely(x) __builtin_expect(!!(x), 0)
                                                ^
      src/gevent/libev/gevent.corecext.c:30323:65: error: too many arguments to function call, expected 3, have 4
          return (*((__Pyx_PyCFunctionFast)meth)) (self, args, nargs, NULL);
                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~                     ^~~~
      /Library/Developer/CommandLineTools/usr/lib/clang/10.0.0/include/stddef.h:105:16: note: expanded from macro 'NULL'
      #  define NULL ((void*)0)
                     ^~~~~~~~~~
      src/gevent/libev/gevent.corecext.c:30535:21: error: no member named 'exc_type' in 'struct _ts'
          *type = tstate->exc_type;
                  ~~~~~~  ^
      src/gevent/libev/gevent.corecext.c:30536:22: error: no member named 'exc_value' in 'struct _ts'; did you mean 'curexc_value'?
          *value = tstate->exc_value;
                           ^~~~~~~~~
                           curexc_value
      /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:240:15: note: 'curexc_value' declared here
          PyObject *curexc_value;
                    ^
      src/gevent/libev/gevent.corecext.c:30537:19: error: no member named 'exc_traceback' in 'struct _ts'; did you mean 'curexc_traceback'?
          *tb = tstate->exc_traceback;
                        ^~~~~~~~~~~~~
                        curexc_traceback
      /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:241:15: note: 'curexc_traceback' declared here
          PyObject *curexc_traceback;
                    ^
      src/gevent/libev/gevent.corecext.c:30544:24: error: no member named 'exc_type' in 'struct _ts'
          tmp_type = tstate->exc_type;
                     ~~~~~~  ^
      src/gevent/libev/gevent.corecext.c:30545:25: error: no member named 'exc_value' in 'struct _ts'; did you mean 'curexc_value'?
          tmp_value = tstate->exc_value;
                              ^~~~~~~~~
                              curexc_value
      /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:240:15: note: 'curexc_value' declared here
          PyObject *curexc_value;
                    ^
      src/gevent/libev/gevent.corecext.c:30546:22: error: no member named 'exc_traceback' in 'struct _ts'; did you mean 'curexc_traceback'?
          tmp_tb = tstate->exc_traceback;
                           ^~~~~~~~~~~~~
                           curexc_traceback
      /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:241:15: note: 'curexc_traceback' declared here
          PyObject *curexc_traceback;
                    ^
      src/gevent/libev/gevent.corecext.c:30547:13: error: no member named 'exc_type' in 'struct _ts'
          tstate->exc_type = type;
          ~~~~~~  ^
      src/gevent/libev/gevent.corecext.c:30548:13: error: no member named 'exc_value' in 'struct _ts'; did you mean 'curexc_value'?
          tstate->exc_value = value;
                  ^~~~~~~~~
                  curexc_value
      /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:240:15: note: 'curexc_value' declared here
          PyObject *curexc_value;
                    ^
      src/gevent/libev/gevent.corecext.c:30549:13: error: no member named 'exc_traceback' in 'struct _ts'; did you mean 'curexc_traceback'?
          tstate->exc_traceback = tb;
                  ^~~~~~~~~~~~~
                  curexc_traceback
      /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:241:15: note: 'curexc_traceback' declared here
          PyObject *curexc_traceback;
                    ^
      src/gevent/libev/gevent.corecext.c:30604:24: error: no member named 'exc_type' in 'struct _ts'
          tmp_type = tstate->exc_type;
                     ~~~~~~  ^
      src/gevent/libev/gevent.corecext.c:30605:25: error: no member named 'exc_value' in 'struct _ts'; did you mean 'curexc_value'?
          tmp_value = tstate->exc_value;
                              ^~~~~~~~~
                              curexc_value
      /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:240:15: note: 'curexc_value' declared here
          PyObject *curexc_value;
                    ^
      src/gevent/libev/gevent.corecext.c:30606:22: error: no member named 'exc_traceback' in 'struct _ts'; did you mean 'curexc_traceback'?
          tmp_tb = tstate->exc_traceback;
                           ^~~~~~~~~~~~~
                           curexc_traceback
      /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:241:15: note: 'curexc_traceback' declared here
          PyObject *curexc_traceback;
                    ^
      src/gevent/libev/gevent.corecext.c:30607:13: error: no member named 'exc_type' in 'struct _ts'
          tstate->exc_type = local_type;
          ~~~~~~  ^
      src/gevent/libev/gevent.corecext.c:30608:13: error: no member named 'exc_value' in 'struct _ts'; did you mean 'curexc_value'?
          tstate->exc_value = local_value;
                  ^~~~~~~~~
                  curexc_value
      /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:240:15: note: 'curexc_value' declared here
          PyObject *curexc_value;
                    ^
      src/gevent/libev/gevent.corecext.c:30609:13: error: no member named 'exc_traceback' in 'struct _ts'; did you mean 'curexc_traceback'?
          tstate->exc_traceback = local_tb;
                  ^~~~~~~~~~~~~
                  curexc_traceback
      /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:241:15: note: 'curexc_traceback' declared here
          PyObject *curexc_traceback;
                    ^
      src/gevent/libev/gevent.corecext.c:31158:24: error: no member named 'exc_type' in 'struct _ts'
          tmp_type = tstate->exc_type;
                     ~~~~~~  ^
      src/gevent/libev/gevent.corecext.c:31159:25: error: no member named 'exc_value' in 'struct _ts'; did you mean 'curexc_value'?
          tmp_value = tstate->exc_value;
                              ^~~~~~~~~
                              curexc_value
      /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:240:15: note: 'curexc_value' declared here
          PyObject *curexc_value;
                    ^
      src/gevent/libev/gevent.corecext.c:31160:22: error: no member named 'exc_traceback' in 'struct _ts'; did you mean 'curexc_traceback'?
          tmp_tb = tstate->exc_traceback;
                           ^~~~~~~~~~~~~
                           curexc_traceback
      /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:241:15: note: 'curexc_traceback' declared here
          PyObject *curexc_traceback;
                    ^
      fatal error: too many errors emitted, stopping now [-ferror-limit=]
      7 warnings and 20 errors generated.
      error: command 'clang' failed with exit status 1

      ----------------------------------------
      Failed building wheel for gevent
      Running setup.py clean for gevent
    Failed to build gevent
    Installing collected packages: gevent
      Running setup.py install for gevent ... error
        Complete output from command /usr/local/opt/python/bin/python3.7 -u -c "import setuptools, tokenize;__file__='/private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-record-rdykn6v0/install-record.txt --single-version-externally-managed --compile:
        /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/distutils/dist.py:274: UserWarning: Unknown distribution option: 'cffi_modules'
          warnings.warn(msg)
        running install
        running build
        running build_py
        creating build
        creating build/lib.macosx-10.13-x86_64-3.7
        creating build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/queue.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/greenlet.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/backdoor.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/_semaphore.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/pywsgi.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/event.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/server.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/thread.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/_util_py2.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/signal.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/_ssl3.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/util.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/builtins.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/local.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/threadpool.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/subprocess.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/_socketcommon.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/timeout.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/os.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/__init__.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/core.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/_ssl2.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/fileobject.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/_fileobjectcommon.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/hub.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/_socket2.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/threading.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/win32util.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/resolver_ares.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/baseserver.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/_fileobjectposix.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/_util.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/lock.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/_sslgte279.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/_socket3.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/monkey.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/select.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/_compat.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/_threading.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/ssl.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/socket.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/pool.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/resolver_thread.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/wsgi.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/_tblib.py -> build/lib.macosx-10.13-x86_64-3.7/gevent
        creating build/lib.macosx-10.13-x86_64-3.7/gevent/libev
        copying src/gevent/libev/_corecffi_build.py -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
        copying src/gevent/libev/__init__.py -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
        copying src/gevent/libev/corecffi.py -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
        running egg_info
        writing src/gevent.egg-info/PKG-INFO
        writing dependency_links to src/gevent.egg-info/dependency_links.txt
        writing requirements to src/gevent.egg-info/requires.txt
        writing top-level names to src/gevent.egg-info/top_level.txt
        reading manifest file 'src/gevent.egg-info/SOURCES.txt'
        reading manifest template 'MANIFEST.in'
        warning: no files found matching 'changelog.rst'
        warning: no files found matching 'known_failures.py'
        warning: no files found matching '.pep8'
        no previously-included directories found matching '*/__pycache__'
        warning: no previously-included files matching '*.so' found anywhere in distribution
        warning: no previously-included files matching '*.o' found anywhere in distribution
        warning: no previously-included files matching '*.lo' found anywhere in distribution
        warning: no previously-included files matching '*.la' found anywhere in distribution
        no previously-included directories found matching 'doc/_build'
        warning: no previously-included files matching '*.pyc' found anywhere in distribution
        warning: no previously-included files matching '.coverage' found under directory 'src/greentest'
        no previously-included directories found matching 'src/greentest/htmlcov'
        warning: no previously-included files matching 'stamp-h?' found under directory 'deps/c-ares'
        warning: no previously-included files matching 'ares_build.h.orig' found under directory 'deps/c-ares'
        warning: no previously-included files matching '_corecffi.c' found under directory 'src/gevent'
        warning: no previously-included files found matching 'Makefile'
        warning: no previously-included files found matching 'configure-output'
        writing manifest file 'src/gevent.egg-info/SOURCES.txt'
        copying src/gevent/_semaphore.pxd -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/ares.pyx -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/cares.pxd -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/cares_ntop.h -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/cares_pton.h -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/dnshelper.c -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/gevent._semaphore.c -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/gevent.ares.c -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/gevent.ares.h -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/python.pxd -> build/lib.macosx-10.13-x86_64-3.7/gevent
        copying src/gevent/libev/_corecffi_cdef.c -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
        copying src/gevent/libev/_corecffi_source.c -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
        copying src/gevent/libev/callbacks.c -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
        copying src/gevent/libev/callbacks.h -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
        copying src/gevent/libev/corecext.ppyx -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
        copying src/gevent/libev/corecext.pyx -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
        copying src/gevent/libev/gevent.corecext.c -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
        copying src/gevent/libev/libev.h -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
        copying src/gevent/libev/libev.pxd -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
        copying src/gevent/libev/libev_vfd.h -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
        copying src/gevent/libev/stathelper.c -> build/lib.macosx-10.13-x86_64-3.7/gevent/libev
        running build_ext
        Running '(cd  "/private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/deps/libev"  && sh ./configure   && cp config.h "$OLDPWD" ) > configure-output.txt' in /private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/build/temp.macosx-10.13-x86_64-3.7/libev
        building 'gevent.libev.corecext' extension
        creating build/temp.macosx-10.13-x86_64-3.7/src
        creating build/temp.macosx-10.13-x86_64-3.7/src/gevent
        creating build/temp.macosx-10.13-x86_64-3.7/src/gevent/libev
        clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -U__llvm__ -DLIBEV_EMBED=1 -DEV_COMMON= -DEV_CLEANUP_ENABLE=0 -DEV_EMBED_ENABLE=0 -DEV_PERIODIC_ENABLE=0 -Ibuild/temp.macosx-10.13-x86_64-3.7/libev -I/private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/deps/libev -I/usr/local/include -I/usr/local/opt/openssl/include -I/usr/local/opt/sqlite/include -I/usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m -c src/gevent/libev/gevent.corecext.c -o build/temp.macosx-10.13-x86_64-3.7/src/gevent/libev/gevent.corecext.o
        In file included from src/gevent/libev/gevent.corecext.c:434:
        In file included from src/gevent/libev/libev.h:2:
        /private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/deps/libev/ev.c:483:48: warning: '/*' within block comment [-Wcomment]
        /*#define MIN_INTERVAL  0.00000095367431640625 /* 1/2**20, good till 2200 */
                                                       ^
        /private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/deps/libev/ev.c:1269:13: warning: comparison of integers of different signs: 'unsigned int' and 'int' [-Wsign-compare]
              if (e < (14 - 24)) /* might not be sharp, but is good enough */
                  ~ ^  ~~~~~~~
        /private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/deps/libev/ev.c:1831:31: warning: 'extern' variable has an initializer [-Wextern-initializer]
          EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
                                      ^
        /private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/deps/libev/ev.c:1940:19: warning: comparison of integers of different signs: 'int' and 'unsigned long' [-Wsign-compare]
          if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
              ~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        /private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/deps/libev/ev.c:3878:34: warning: '&' within '|' [-Wbitwise-op-parentheses]
          fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
                               ~~~~~~~~~~^~~~~~~~~~~~~ ~
        /private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/deps/libev/ev.c:3878:34: note: place parentheses around the '&' expression to silence this warning
          fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
                                         ^
                               (                      )
        src/gevent/libev/gevent.corecext.c:3314:104: warning: comparison of integers of different signs: 'unsigned int' and 'int' [-Wsign-compare]
          __pyx_t_1 = __pyx_f_6gevent_5libev_8corecext__flags_to_int(__pyx_v_flags, 0); if (unlikely(__pyx_t_1 == -1 && PyErr_Occurred())) __PYX_ERR(0, 168, __pyx_L1_error)
                                                                                                     ~~~~~~~~~ ^  ~~
        src/gevent/libev/gevent.corecext.c:614:43: note: expanded from macro 'unlikely'
          #define unlikely(x) __builtin_expect(!!(x), 0)
                                                  ^
        src/gevent/libev/gevent.corecext.c:4092:106: warning: comparison of integers of different signs: 'unsigned int' and 'int' [-Wsign-compare]
            __pyx_t_2 = __pyx_f_6gevent_5libev_8corecext__flags_to_int(__pyx_v_flags, 0); if (unlikely(__pyx_t_2 == -1 && PyErr_Occurred())) __PYX_ERR(0, 267, __pyx_L1_error)
                                                                                                       ~~~~~~~~~ ^  ~~
        src/gevent/libev/gevent.corecext.c:614:43: note: expanded from macro 'unlikely'
          #define unlikely(x) __builtin_expect(!!(x), 0)
                                                  ^
        src/gevent/libev/gevent.corecext.c:30323:65: error: too many arguments to function call, expected 3, have 4
            return (*((__Pyx_PyCFunctionFast)meth)) (self, args, nargs, NULL);
                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~                     ^~~~
        /Library/Developer/CommandLineTools/usr/lib/clang/10.0.0/include/stddef.h:105:16: note: expanded from macro 'NULL'
        #  define NULL ((void*)0)
                       ^~~~~~~~~~
        src/gevent/libev/gevent.corecext.c:30535:21: error: no member named 'exc_type' in 'struct _ts'
            *type = tstate->exc_type;
                    ~~~~~~  ^
        src/gevent/libev/gevent.corecext.c:30536:22: error: no member named 'exc_value' in 'struct _ts'; did you mean 'curexc_value'?
            *value = tstate->exc_value;
                             ^~~~~~~~~
                             curexc_value
        /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:240:15: note: 'curexc_value' declared here
            PyObject *curexc_value;
                      ^
        src/gevent/libev/gevent.corecext.c:30537:19: error: no member named 'exc_traceback' in 'struct _ts'; did you mean 'curexc_traceback'?
            *tb = tstate->exc_traceback;
                          ^~~~~~~~~~~~~
                          curexc_traceback
        /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:241:15: note: 'curexc_traceback' declared here
            PyObject *curexc_traceback;
                      ^
        src/gevent/libev/gevent.corecext.c:30544:24: error: no member named 'exc_type' in 'struct _ts'
            tmp_type = tstate->exc_type;
                       ~~~~~~  ^
        src/gevent/libev/gevent.corecext.c:30545:25: error: no member named 'exc_value' in 'struct _ts'; did you mean 'curexc_value'?
            tmp_value = tstate->exc_value;
                                ^~~~~~~~~
                                curexc_value
        /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:240:15: note: 'curexc_value' declared here
            PyObject *curexc_value;
                      ^
        src/gevent/libev/gevent.corecext.c:30546:22: error: no member named 'exc_traceback' in 'struct _ts'; did you mean 'curexc_traceback'?
            tmp_tb = tstate->exc_traceback;
                             ^~~~~~~~~~~~~
                             curexc_traceback
        /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:241:15: note: 'curexc_traceback' declared here
            PyObject *curexc_traceback;
                      ^
        src/gevent/libev/gevent.corecext.c:30547:13: error: no member named 'exc_type' in 'struct _ts'
            tstate->exc_type = type;
            ~~~~~~  ^
        src/gevent/libev/gevent.corecext.c:30548:13: error: no member named 'exc_value' in 'struct _ts'; did you mean 'curexc_value'?
            tstate->exc_value = value;
                    ^~~~~~~~~
                    curexc_value
        /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:240:15: note: 'curexc_value' declared here
            PyObject *curexc_value;
                      ^
        src/gevent/libev/gevent.corecext.c:30549:13: error: no member named 'exc_traceback' in 'struct _ts'; did you mean 'curexc_traceback'?
            tstate->exc_traceback = tb;
                    ^~~~~~~~~~~~~
                    curexc_traceback
        /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:241:15: note: 'curexc_traceback' declared here
            PyObject *curexc_traceback;
                      ^
        src/gevent/libev/gevent.corecext.c:30604:24: error: no member named 'exc_type' in 'struct _ts'
            tmp_type = tstate->exc_type;
                       ~~~~~~  ^
        src/gevent/libev/gevent.corecext.c:30605:25: error: no member named 'exc_value' in 'struct _ts'; did you mean 'curexc_value'?
            tmp_value = tstate->exc_value;
                                ^~~~~~~~~
                                curexc_value
        /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:240:15: note: 'curexc_value' declared here
            PyObject *curexc_value;
                      ^
        src/gevent/libev/gevent.corecext.c:30606:22: error: no member named 'exc_traceback' in 'struct _ts'; did you mean 'curexc_traceback'?
            tmp_tb = tstate->exc_traceback;
                             ^~~~~~~~~~~~~
                             curexc_traceback
        /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:241:15: note: 'curexc_traceback' declared here
            PyObject *curexc_traceback;
                      ^
        src/gevent/libev/gevent.corecext.c:30607:13: error: no member named 'exc_type' in 'struct _ts'
            tstate->exc_type = local_type;
            ~~~~~~  ^
        src/gevent/libev/gevent.corecext.c:30608:13: error: no member named 'exc_value' in 'struct _ts'; did you mean 'curexc_value'?
            tstate->exc_value = local_value;
                    ^~~~~~~~~
                    curexc_value
        /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:240:15: note: 'curexc_value' declared here
            PyObject *curexc_value;
                      ^
        src/gevent/libev/gevent.corecext.c:30609:13: error: no member named 'exc_traceback' in 'struct _ts'; did you mean 'curexc_traceback'?
            tstate->exc_traceback = local_tb;
                    ^~~~~~~~~~~~~
                    curexc_traceback
        /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:241:15: note: 'curexc_traceback' declared here
            PyObject *curexc_traceback;
                      ^
        src/gevent/libev/gevent.corecext.c:31158:24: error: no member named 'exc_type' in 'struct _ts'
            tmp_type = tstate->exc_type;
                       ~~~~~~  ^
        src/gevent/libev/gevent.corecext.c:31159:25: error: no member named 'exc_value' in 'struct _ts'; did you mean 'curexc_value'?
            tmp_value = tstate->exc_value;
                                ^~~~~~~~~
                                curexc_value
        /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:240:15: note: 'curexc_value' declared here
            PyObject *curexc_value;
                      ^
        src/gevent/libev/gevent.corecext.c:31160:22: error: no member named 'exc_traceback' in 'struct _ts'; did you mean 'curexc_traceback'?
            tmp_tb = tstate->exc_traceback;
                             ^~~~~~~~~~~~~
                             curexc_traceback
        /usr/local/Cellar/python/3.7.2_1/Frameworks/Python.framework/Versions/3.7/include/python3.7m/pystate.h:241:15: note: 'curexc_traceback' declared here
            PyObject *curexc_traceback;
                      ^
        fatal error: too many errors emitted, stopping now [-ferror-limit=]
        7 warnings and 20 errors generated.
        error: command 'clang' failed with exit status 1

        ----------------------------------------
    Command "/usr/local/opt/python/bin/python3.7 -u -c "import setuptools, tokenize;__file__='/private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-record-rdykn6v0/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/var/folders/0f/bp0p28fn5n9bwtg6wt7bs8nm0000gn/T/pip-install-2sumork0/gevent/
    v