pip3 install issue
## Environment info
<!-- You can run the command `transformers-cli env` and copy-and-paste its output below.
     Don't forget to fill out the missing fields in that output! -->
     
- `transformers` version: 3.3.1
- Platform: macOS
- Python version: 3.8.2
- PyTorch version (GPU?):-
- Tensorflow version (GPU?):-
- Using GPU in script?:-
- Using distributed or parallel set-up in script?:-

### Who can help
<!-- Your issue will be replied to more quickly if you can figure out the right person to tag with @
 If you know how to use git blame, that is the easiest way, otherwise, here is a rough guide of **who to tag**.
 Please tag fewer than 3 people.
 
 albert, bert, GPT2, XLM: @LysandreJik 
 tokenizers: @mfuntowicz
 Trainer: @sgugger
 Speed and Memory Benchmarks: @patrickvonplaten
 Model Cards: @julien-c
 Translation: @sshleifer
 Summarization: @sshleifer
 TextGeneration: @TevenLeScao 
 examples/distillation: @VictorSanh
 nlp datasets: [different repo](https://github.com/huggingface/nlp)
 rust tokenizers: [different repo](https://github.com/huggingface/tokenizers)
 Text Generation: @TevenLeScao
 blenderbot: @mariamabarham
 Bart: @sshleifer
 Marian: @sshleifer
 T5: @patrickvonplaten
 Longformer/Reformer: @patrickvonplaten
 TransfoXL/XLNet: @TevenLeScao 
 examples/seq2seq: @sshleifer
 examples/bert-loses-patience: @JetRunner
 tensorflow: @jplu
 examples/token-classification: @stefan-it
 documentation: @sgugger
 -->

## Information

Model I am using (Bert, XLNet ...):

The problem arises when using:
* [ ] the official example scripts: (give details below)
* [ ] my own modified scripts: (give details below)

The tasks I am working on is:
* [ ] an official GLUE/SQUaD task: (give the name)
* [ ] my own task or dataset: (give details below)

## To reproduce

Steps to reproduce the behavior:

1. Just do pip3 install transformers in a machine installed macOS Catalina 10.15.7 and XCode version 12.0.1


<!-- If you have code snippets, error messages, stack traces please provide them here as well.
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```
Alis-MacBook-Pro:ali_taha_dincer_2020 alitahadincer$ sudo pip3 install transformers
Password:
WARNING: The directory '/Users/alitahadincer/Library/Caches/pip' or its parent directory is not owned or is not writable by the current user. The cache has been disabled. Check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Collecting transformers
  Downloading transformers-3.3.1-py3-none-any.whl (1.1 MB)
     |████████████████████████████████| 1.1 MB 571 kB/s 
Collecting tokenizers==0.8.1.rc2
  Downloading tokenizers-0.8.1rc2-cp38-cp38-macosx_10_14_x86_64.whl (2.1 MB)
     |████████████████████████████████| 2.1 MB 938 kB/s 
Collecting regex!=2019.12.17
  Downloading regex-2020.10.11.tar.gz (690 kB)
     |████████████████████████████████| 690 kB 1.0 MB/s 
Collecting sacremoses
  Downloading sacremoses-0.0.43.tar.gz (883 kB)
     |████████████████████████████████| 883 kB 1.2 MB/s 
Requirement already satisfied: numpy in /Library/Python/3.8/site-packages (from transformers) (1.18.5)
Collecting sentencepiece!=0.1.92
  Downloading sentencepiece-0.1.91-cp38-cp38-macosx_10_6_x86_64.whl (1.0 MB)
     |████████████████████████████████| 1.0 MB 1.5 MB/s 
Requirement already satisfied: requests in /Library/Python/3.8/site-packages (from transformers) (2.24.0)
Requirement already satisfied: tqdm>=4.27 in /Library/Python/3.8/site-packages (from transformers) (4.50.2)
Requirement already satisfied: filelock in /Library/Python/3.8/site-packages (from transformers) (3.0.12)
Collecting packaging
  Downloading packaging-20.4-py2.py3-none-any.whl (37 kB)
Requirement already satisfied: six in /Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.8/lib/python3.8/site-packages (from sacremoses->transformers) (1.15.0)
Requirement already satisfied: click in /Library/Python/3.8/site-packages (from sacremoses->transformers) (7.1.2)
Collecting joblib
  Downloading joblib-0.17.0-py3-none-any.whl (301 kB)
     |████████████████████████████████| 301 kB 1.4 MB/s 
Requirement already satisfied: chardet<4,>=3.0.2 in /Library/Python/3.8/site-packages (from requests->transformers) (3.0.4)
Requirement already satisfied: idna<3,>=2.5 in /Library/Python/3.8/site-packages (from requests->transformers) (2.10)
Requirement already satisfied: certifi>=2017.4.17 in /Library/Python/3.8/site-packages (from requests->transformers) (2020.6.20)
Requirement already satisfied: urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1 in /Library/Python/3.8/site-packages (from requests->transformers) (1.25.10)
Collecting pyparsing>=2.0.2
  Downloading pyparsing-2.4.7-py2.py3-none-any.whl (67 kB)
     |████████████████████████████████| 67 kB 880 kB/s 
Building wheels for collected packages: regex, sacremoses
  Building wheel for regex (setup.py) ... error
  ERROR: Command errored out with exit status 1:
   command: /Applications/Xcode.app/Contents/Developer/usr/bin/python3 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/tmp/pip-install-j20cf16z/regex/setup.py'"'"'; __file__='"'"'/private/tmp/pip-install-j20cf16z/regex/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/tmp/pip-wheel-461le_2e
       cwd: /private/tmp/pip-install-j20cf16z/regex/
  Complete output (114 lines):
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build/lib.macosx-10.14.6-x86_64-3.8
  creating build/lib.macosx-10.14.6-x86_64-3.8/regex
  copying regex_3/__init__.py -> build/lib.macosx-10.14.6-x86_64-3.8/regex
  copying regex_3/regex.py -> build/lib.macosx-10.14.6-x86_64-3.8/regex
  copying regex_3/_regex_core.py -> build/lib.macosx-10.14.6-x86_64-3.8/regex
  copying regex_3/test_regex.py -> build/lib.macosx-10.14.6-x86_64-3.8/regex
  running build_ext
  building 'regex._regex' extension
  creating build/temp.macosx-10.14.6-x86_64-3.8
  creating build/temp.macosx-10.14.6-x86_64-3.8/regex_3
  xcrun -sdk macosx clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -iwithsysroot/System/Library/Frameworks/System.framework/PrivateHeaders -iwithsysroot/Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.8/Headers -arch arm64 -arch x86_64 -I/Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.8/include/python3.8 -c regex_3/_regex.c -o build/temp.macosx-10.14.6-x86_64-3.8/regex_3/_regex.o
  In file included from regex_3/_regex.c:48:
  In file included from /Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.8/include/python3.8/Python.h:11:
  In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/limits.h:21:
  In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/limits.h:63:
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/cdefs.h:807:2: error: Unsupported architecture
  #error Unsupported architecture
   ^
  In file included from regex_3/_regex.c:48:
  In file included from /Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.8/include/python3.8/Python.h:11:
  In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/limits.h:21:
  In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/limits.h:64:
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/machine/limits.h:8:2: error: architecture not supported
  #error architecture not supported
   ^
  In file included from regex_3/_regex.c:48:
  In file included from /Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.8/include/python3.8/Python.h:25:
  In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/stdio.h:64:
  In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/_stdio.h:71:
  In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/_types.h:27:
  In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:33:
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/machine/_types.h:34:2: error: architecture not supported
  #error architecture not supported
   ^
  In file included from regex_3/_regex.c:48:
  In file included from /Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.8/include/python3.8/Python.h:25:
  In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/stdio.h:64:
  In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/_stdio.h:71:
  In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/_types.h:27:
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:55:9: error: unknown type name '__int64_t'
  typedef __int64_t       __darwin_blkcnt_t;      /* total blocks */
          ^
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:56:9: error: unknown type name '__int32_t'; did you mean '__int128_t'?
  typedef __int32_t       __darwin_blksize_t;     /* preferred block size */
          ^
  note: '__int128_t' declared here
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:57:9: error: unknown type name '__int32_t'; did you mean '__int128_t'?
  typedef __int32_t       __darwin_dev_t;         /* dev_t */
          ^
  note: '__int128_t' declared here
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:60:9: error: unknown type name '__uint32_t'; did you mean '__uint128_t'?
  typedef __uint32_t      __darwin_gid_t;         /* [???] process and group IDs */
          ^
  note: '__uint128_t' declared here
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:61:9: error: unknown type name '__uint32_t'; did you mean '__uint128_t'?
  typedef __uint32_t      __darwin_id_t;          /* [XSI] pid_t, uid_t, or gid_t*/
          ^
  note: '__uint128_t' declared here
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:62:9: error: unknown type name '__uint64_t'
  typedef __uint64_t      __darwin_ino64_t;       /* [???] Used for 64 bit inodes */
          ^
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:68:9: error: unknown type name '__darwin_natural_t'
  typedef __darwin_natural_t __darwin_mach_port_name_t; /* Used by mach */
          ^
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:70:9: error: unknown type name '__uint16_t'; did you mean '__uint128_t'?
  typedef __uint16_t      __darwin_mode_t;        /* [???] Some file attributes */
          ^
  note: '__uint128_t' declared here
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:71:9: error: unknown type name '__int64_t'
  typedef __int64_t       __darwin_off_t;         /* [???] Used for file sizes */
          ^
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:72:9: error: unknown type name '__int32_t'; did you mean '__int128_t'?
  typedef __int32_t       __darwin_pid_t;         /* [???] process and group IDs */
          ^
  note: '__int128_t' declared here
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:73:9: error: unknown type name '__uint32_t'; did you mean '__uint128_t'?
  typedef __uint32_t      __darwin_sigset_t;      /* [???] signal set */
          ^
  note: '__uint128_t' declared here
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:74:9: error: unknown type name '__int32_t'; did you mean '__int128_t'?
  typedef __int32_t       __darwin_suseconds_t;   /* [???] microseconds */
          ^
  note: '__int128_t' declared here
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:75:9: error: unknown type name '__uint32_t'; did you mean '__uint128_t'?
  typedef __uint32_t      __darwin_uid_t;         /* [???] user IDs */
          ^
  note: '__uint128_t' declared here
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:76:9: error: unknown type name '__uint32_t'; did you mean '__uint128_t'?
  typedef __uint32_t      __darwin_useconds_t;    /* [???] microseconds */
          ^
  note: '__uint128_t' declared here
  In file included from regex_3/_regex.c:48:
  In file included from /Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.8/include/python3.8/Python.h:25:
  In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/stdio.h:64:
  In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/_stdio.h:71:
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/_types.h:43:9: error: unknown type name '__uint32_t'; did you mean '__uint128_t'?
  typedef __uint32_t      __darwin_wctype_t;
          ^
  note: '__uint128_t' declared here
  In file included from regex_3/_regex.c:48:
  In file included from /Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.8/include/python3.8/Python.h:25:
  In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/stdio.h:64:
  In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/_stdio.h:75:
  In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types/_va_list.h:31:
  /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/machine/types.h:37:2: error: architecture not supported
  #error architecture not supported
   ^
  fatal error: too many errors emitted, stopping now [-ferror-limit=]
  20 errors generated.
  error: command 'xcrun' failed with exit status 1
  ----------------------------------------
  ERROR: Failed building wheel for regex
  Running setup.py clean for regex
  Building wheel for sacremoses (setup.py) ... done
  Created wheel for sacremoses: filename=sacremoses-0.0.43-py3-none-any.whl size=893259 sha256=b122e1b7fed3e4255e25cd3028672a60cb443062e9136993553b8ed40d2fd193
  Stored in directory: /private/tmp/pip-ephem-wheel-cache-pguj75nn/wheels/7b/78/f4/27d43a65043e1b75dbddaa421b573eddc67e712be4b1c80677
Successfully built sacremoses
Failed to build regex
Installing collected packages: tokenizers, regex, joblib, sacremoses, sentencepiece, pyparsing, packaging, transformers
    Running setup.py install for regex ... error
    ERROR: Command errored out with exit status 1:
     command: /Applications/Xcode.app/Contents/Developer/usr/bin/python3 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/tmp/pip-install-j20cf16z/regex/setup.py'"'"'; __file__='"'"'/private/tmp/pip-install-j20cf16z/regex/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/tmp/pip-record-cgmi3mph/install-record.txt --single-version-externally-managed --compile --install-headers /Library/Python/3.8/include/regex
         cwd: /private/tmp/pip-install-j20cf16z/regex/
    Complete output (114 lines):
    running install
    running build
    running build_py
    creating build
    creating build/lib.macosx-10.14.6-x86_64-3.8
    creating build/lib.macosx-10.14.6-x86_64-3.8/regex
    copying regex_3/__init__.py -> build/lib.macosx-10.14.6-x86_64-3.8/regex
    copying regex_3/regex.py -> build/lib.macosx-10.14.6-x86_64-3.8/regex
    copying regex_3/_regex_core.py -> build/lib.macosx-10.14.6-x86_64-3.8/regex
    copying regex_3/test_regex.py -> build/lib.macosx-10.14.6-x86_64-3.8/regex
    running build_ext
    building 'regex._regex' extension
    creating build/temp.macosx-10.14.6-x86_64-3.8
    creating build/temp.macosx-10.14.6-x86_64-3.8/regex_3
    xcrun -sdk macosx clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -iwithsysroot/System/Library/Frameworks/System.framework/PrivateHeaders -iwithsysroot/Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.8/Headers -arch arm64 -arch x86_64 -I/Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.8/include/python3.8 -c regex_3/_regex.c -o build/temp.macosx-10.14.6-x86_64-3.8/regex_3/_regex.o
    In file included from regex_3/_regex.c:48:
    In file included from /Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.8/include/python3.8/Python.h:11:
    In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/limits.h:21:
    In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/limits.h:63:
    /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/cdefs.h:807:2: error: Unsupported architecture
    #error Unsupported architecture
     ^
    In file included from regex_3/_regex.c:48:
    In file included from /Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.8/include/python3.8/Python.h:11:
    In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/limits.h:21:
    In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/limits.h:64:
    /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/machine/limits.h:8:2: error: architecture not supported
    #error architecture not supported
     ^
    In file included from regex_3/_regex.c:48:
    In file included from /Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.8/include/python3.8/Python.h:25:
    In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/stdio.h:64:
    In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/_stdio.h:71:
    In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/_types.h:27:
    In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:33:
    /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/machine/_types.h:34:2: error: architecture not supported
    #error architecture not supported
     ^
    In file included from regex_3/_regex.c:48:
    In file included from /Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.8/include/python3.8/Python.h:25:
    In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/stdio.h:64:
    In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/_stdio.h:71:
    In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/_types.h:27:
    /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:55:9: error: unknown type name '__int64_t'
    typedef __int64_t       __darwin_blkcnt_t;      /* total blocks */
            ^
    /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:56:9: error: unknown type name '__int32_t'; did you mean '__int128_t'?
    typedef __int32_t       __darwin_blksize_t;     /* preferred block size */
            ^
    note: '__int128_t' declared here
    /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:57:9: error: unknown type name '__int32_t'; did you mean '__int128_t'?
    typedef __int32_t       __darwin_dev_t;         /* dev_t */
            ^
    note: '__int128_t' declared here
    /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:60:9: error: unknown type name '__uint32_t'; did you mean '__uint128_t'?
    typedef __uint32_t      __darwin_gid_t;         /* [???] process and group IDs */
            ^
    note: '__uint128_t' declared here
    /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:61:9: error: unknown type name '__uint32_t'; did you mean '__uint128_t'?
    typedef __uint32_t      __darwin_id_t;          /* [XSI] pid_t, uid_t, or gid_t*/
            ^
    note: '__uint128_t' declared here
    /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:62:9: error: unknown type name '__uint64_t'
    typedef __uint64_t      __darwin_ino64_t;       /* [???] Used for 64 bit inodes */
            ^
    /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:68:9: error: unknown type name '__darwin_natural_t'
    typedef __darwin_natural_t __darwin_mach_port_name_t; /* Used by mach */
            ^
    /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:70:9: error: unknown type name '__uint16_t'; did you mean '__uint128_t'?
    typedef __uint16_t      __darwin_mode_t;        /* [???] Some file attributes */
            ^
    note: '__uint128_t' declared here
    /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:71:9: error: unknown type name '__int64_t'
    typedef __int64_t       __darwin_off_t;         /* [???] Used for file sizes */
            ^
    /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:72:9: error: unknown type name '__int32_t'; did you mean '__int128_t'?
    typedef __int32_t       __darwin_pid_t;         /* [???] process and group IDs */
            ^
    note: '__int128_t' declared here
    /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:73:9: error: unknown type name '__uint32_t'; did you mean '__uint128_t'?
    typedef __uint32_t      __darwin_sigset_t;      /* [???] signal set */
            ^
    note: '__uint128_t' declared here
    /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:74:9: error: unknown type name '__int32_t'; did you mean '__int128_t'?
    typedef __int32_t       __darwin_suseconds_t;   /* [???] microseconds */
            ^
    note: '__int128_t' declared here
    /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:75:9: error: unknown type name '__uint32_t'; did you mean '__uint128_t'?
    typedef __uint32_t      __darwin_uid_t;         /* [???] user IDs */
            ^
    note: '__uint128_t' declared here
    /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types.h:76:9: error: unknown type name '__uint32_t'; did you mean '__uint128_t'?
    typedef __uint32_t      __darwin_useconds_t;    /* [???] microseconds */
            ^
    note: '__uint128_t' declared here
    In file included from regex_3/_regex.c:48:
    In file included from /Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.8/include/python3.8/Python.h:25:
    In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/stdio.h:64:
    In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/_stdio.h:71:
    /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/_types.h:43:9: error: unknown type name '__uint32_t'; did you mean '__uint128_t'?
    typedef __uint32_t      __darwin_wctype_t;
            ^
    note: '__uint128_t' declared here
    In file included from regex_3/_regex.c:48:
    In file included from /Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.8/include/python3.8/Python.h:25:
    In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/stdio.h:64:
    In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/_stdio.h:75:
    In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/sys/_types/_va_list.h:31:
    /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include/machine/types.h:37:2: error: architecture not supported
    #error architecture not supported
     ^
    fatal error: too many errors emitted, stopping now [-ferror-limit=]
    20 errors generated.
    error: command 'xcrun' failed with exit status 1
    ----------------------------------------
ERROR: Command errored out with exit status 1: /Applications/Xcode.app/Contents/Developer/usr/bin/python3 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/tmp/pip-install-j20cf16z/regex/setup.py'"'"'; __file__='"'"'/private/tmp/pip-install-j20cf16z/regex/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/tmp/pip-record-cgmi3mph/install-record.txt --single-version-externally-managed --compile --install-headers /Library/Python/3.8/include/regex Check the logs for full command output.
```

## Expected behavior

<!-- A clear and concise description of what you would expect to happen. -->

This seems to be an error when installing `regex`, can you install it on its own? If you cannot, please open an issue on [their repo](https://bitbucket.org/mrabarnett/mrab-regex/issues?status=new&status=open).<|||||>Thank you, I was not aware of that even I looked into trace twice. Closing the issue.