I’m getting an error while installing Rasa Core on Mac.
$ pip install -U rasa_core
> Building wheels for collected packages: greenlet, Twisted
> Building wheel for greenlet (setup.py) ... error
> ERROR: Complete output from command /Users/mohit/work/env/py36/bin/python3.6 -u -c 'import setuptools, tokenize;__file__='"'"'/private/var/folders/9t/0qgpwgy906z_sww71dnkgkr80000gn/T/pip-install-6geuufup/greenlet/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/9t/0qgpwgy906z_sww71dnkgkr80000gn/T/pip-wheel-s6trqck6 --python-tag cp36:
> ERROR: running bdist_wheel
> running build
> running build_ext
> building 'greenlet' extension
> creating build
> creating build/temp.macosx-10.7-x86_64-3.6
> gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/Users/mohit/anaconda3/include -arch x86_64 -I/Users/mohit/anaconda3/include -arch x86_64 /usr/local/opt/openssl/include -I/Users/mohit/anaconda3/include/python3.6m -c greenlet.c -o build/temp.macosx-10.7-x86_64-3.6/greenlet.o
> clang: warning: /usr/local/opt/openssl/include: 'linker' input unused [-Wunused-command-line-argument]
> creating build/lib.macosx-10.7-x86_64-3.6
> gcc -bundle -undefined dynamic_lookup -L/Users/mohit/anaconda3/lib -arch x86_64 -L/Users/mohit/anaconda3/lib -arch x86_64 /usr/local/opt/openssl/lib /usr/local/opt/openssl/include -arch x86_64 build/temp.macosx-10.7-x86_64-3.6/greenlet.o -o build/lib.macosx-10.7-x86_64-3.6/greenlet.cpython-36m-darwin.so
> ld: cant map file, errno=22 file '/usr/local/opt/openssl/lib' for architecture x86_64
> clang: error: linker command failed with exit code 1 (use -v to see invocation)
> error: command 'gcc' failed with exit status 1
> ----------------------------------------
> ERROR: Failed building wheel for greenlet
> Running setup.py clean for greenlet
> Building wheel for Twisted (setup.py) ... error
> ERROR: Complete output from command /Users/mohit/work/env/py36/bin/python3.6 -u -c 'import setuptools, tokenize;__file__='"'"'/private/var/folders/9t/0qgpwgy906z_sww71dnkgkr80000gn/T/pip-install-6geuufup/Twisted/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/9t/0qgpwgy906z_sww71dnkgkr80000gn/T/pip-wheel-20wsj7ye --python-tag cp36:
> ERROR: running bdist_wheel
> running build
> running build_py
> creating build
> creating build/lib.macosx-10.7-x86_64-3.6
> creating build/lib.macosx-10.7-x86_64-3.6/twisted
> ...
> ...
> creating build/temp.macosx-10.7-x86_64-3.6/src/twisted/test
> gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/Users/mohit/anaconda3/include -arch x86_64 -I/Users/mohit/anaconda3/include -arch x86_64 /usr/local/opt/openssl/include -I/Users/mohit/anaconda3/include/python3.6m -c src/twisted/test/raiser.c -o build/temp.macosx-10.7-x86_64-3.6/src/twisted/test/raiser.o
> clang: warning: /usr/local/opt/openssl/include: 'linker' input unused [-Wunused-command-line-argument]
> gcc -bundle -undefined dynamic_lookup -L/Users/mohit/anaconda3/lib -arch x86_64 -L/Users/mohit/anaconda3/lib -arch x86_64 /usr/local/opt/openssl/lib /usr/local/opt/openssl/include -arch x86_64 build/temp.macosx-10.7-x86_64-3.6/src/twisted/test/raiser.o -o build/lib.macosx-10.7-x86_64-3.6/twisted/test/raiser.cpython-36m-darwin.so
> ld: cant map file, errno=22 file '/usr/local/opt/openssl/include' for architecture x86_64
> clang: error: linker command failed with exit code 1 (use -v to see invocation)
> error: command 'gcc' failed with exit status 1
> ----------------------------------------
> ERROR: Failed building wheel for Twisted
> Running setup.py clean for Twisted
> Failed to build greenlet Twisted
> Installing collected packages: colorclass, humanfriendly, coloredlogs, numpy, scipy, wcwidth, six, prompt-toolkit, questionary, tqdm, Werkzeug, MarkupSafe, Jinja2, itsdangerous, click, flask, jsonschema, python-engineio, python-socketio, pyparsing, packaging, certifi, urllib3, idna, chardet, requests, websocket-client, slackclient, scikit-learn, redis, pytz, tzlocal, apscheduler, fbmessenger, future, requests-toolbelt, webexteamssdk, pydot, flask-cors, rocketchat-API, h5py, keras-applications, protobuf, astor, gast, termcolor, keras-preprocessing, grpcio, absl-py, markdown, tensorboard, pbr, mock, tensorflow-estimator, tensorflow, PyJWT, pysocks, twilio, python-dateutil, typing, ConfigArgParse, greenlet, gevent, rasa-core-sdk, flask-jwt-simple, cycler, kiwisolver, matplotlib, jmespath, docutils, botocore, s3transfer, boto3, incremental, zope.interface, constantly, attrs, Automat, hyperlink, PyHamcrest, Twisted, klein, simplejson, ruamel.yaml, cloudpickle, rasa-nlu, decorator, networkx, jsonpickle, fakeredis, docopt, PyYAML, pykwalify, pymongo, colorhash, terminaltables, pika, pycparser, cffi, asn1crypto, cryptography, python-telegram-bot, mattermostwrapper, rasa-core
> Running setup.py install for greenlet ... error
> ERROR: Complete output from command /Users/mohit/work/env/py36/bin/python3.6 -u -c 'import setuptools, tokenize;__file__='"'"'/private/var/folders/9t/0qgpwgy906z_sww71dnkgkr80000gn/T/pip-install-6geuufup/greenlet/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/9t/0qgpwgy906z_sww71dnkgkr80000gn/T/pip-record-jmucnthc/install-record.txt --single-version-externally-managed --compile --install-headers /Users/mohit/work/env/py36/include/site/python3.6/greenlet:
> ERROR: running install
> running build
> running build_ext
> building 'greenlet' extension
> creating build
> creating build/temp.macosx-10.7-x86_64-3.6
> gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/Users/mohit/anaconda3/include -arch x86_64 -I/Users/mohit/anaconda3/include -arch x86_64 /usr/local/opt/openssl/include -I/Users/mohit/anaconda3/include/python3.6m -c greenlet.c -o build/temp.macosx-10.7-x86_64-3.6/greenlet.o
> clang: warning: /usr/local/opt/openssl/include: 'linker' input unused [-Wunused-command-line-argument]
> creating build/lib.macosx-10.7-x86_64-3.6
> gcc -bundle -undefined dynamic_lookup -L/Users/mohit/anaconda3/lib -arch x86_64 -L/Users/mohit/anaconda3/lib -arch x86_64 /usr/local/opt/openssl/lib /usr/local/opt/openssl/include -arch x86_64 build/temp.macosx-10.7-x86_64-3.6/greenlet.o -o build/lib.macosx-10.7-x86_64-3.6/greenlet.cpython-36m-darwin.so
> ld: cant map file, errno=22 file '/usr/local/opt/openssl/lib' for architecture x86_64
> clang: error: linker command failed with exit code 1 (use -v to see invocation)
> error: command 'gcc' failed with exit status 1
> ----------------------------------------
> ERROR: Command "/Users/mohit/work/env/py36/bin/python3.6 -u -c 'import setuptools, tokenize;__file__='"'"'/private/var/folders/9t/0qgpwgy906z_sww71dnkgkr80000gn/T/pip-install-6geuufup/greenlet/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/9t/0qgpwgy906z_sww71dnkgkr80000gn/T/pip-record-jmucnthc/install-record.txt --single-version-externally-managed --compile --install-headers /Users/mohit/work/env/py36/include/site/python3.6/greenlet" failed with error code 1 in /private/var/folders/9t/0qgpwgy906z_sww71dnkgkr80000gn/T/pip-install-6geuufup/greenlet/