title: Pip install failing with error: command 'clang' failed with exit status 1 on Big Sur 11.1
body: <p>I'm on MacOs Big Sur 11.1. I'm unable to use pip install. When trying to run <code>pip install -r requirements.txt</code> I get the following error:</p>
  <pre><code>copying pandas/tests/indexes/timedeltas/test_construction.py -&gt; build/lib.macosx-11.0-x86_64-3.7/pandas/tests/indexes/timedeltas
  copying pandas/tests/indexes/timedeltas/test_partial_slicing.py -&gt; build/lib.macosx-11.0-x86_64-3.7/pandas/tests/indexes/timedeltas
  copying pandas/tests/indexes/timedeltas/test_ops.py -&gt; build/lib.macosx-11.0-x86_64-3.7/pandas/tests/indexes/timedeltas
  copying pandas/tests/indexes/timedeltas/test_arithmetic.py -&gt; build/lib.macosx-11.0-x86_64-3.7/pandas/tests/indexes/timedeltas
  copying pandas/tests/indexes/timedeltas/test_timedelta_range.py -&gt; build/lib.macosx-11.0-x86_64-3.7/pandas/tests/indexes/timedeltas
  copying pandas/tests/indexes/timedeltas/test_tools.py -&gt; build/lib.macosx-11.0-x86_64-3.7/pandas/tests/indexes/timedeltas
  creating build/lib.macosx-11.0-x86_64-3.7/pandas/_libs/tslibs
  copying pandas/_libs/tslibs/__init__.py -&gt; build/lib.macosx-11.0-x86_64-3.7/pandas/_libs/tslibs
  creating build/lib.macosx-11.0-x86_64-3.7/pandas/api/types
  copying pandas/api/types/__init__.py -&gt; build/lib.macosx-11.0-x86_64-3.7/pandas/api/types
  creating build/lib.macosx-11.0-x86_64-3.7/pandas/api/extensions
  copying pandas/api/extensions/__init__.py -&gt; build/lib.macosx-11.0-x86_64-3.7/pandas/api/extensions
  creating build/lib.macosx-11.0-x86_64-3.7/pandas/io/formats/templates
  copying pandas/io/formats/templates/html.tpl -&gt; build/lib.macosx-11.0-x86_64-3.7/pandas/io/formats/templates
  UPDATING build/lib.macosx-11.0-x86_64-3.7/pandas/_version.py
  set build/lib.macosx-11.0-x86_64-3.7/pandas/_version.py to '0.23.4'
  running build_ext
  building 'pandas._libs.algos' extension
  creating build/temp.macosx-11.0-x86_64-3.7
  creating build/temp.macosx-11.0-x86_64-3.7/pandas
  creating build/temp.macosx-11.0-x86_64-3.7/pandas/_libs
  clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -I/Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -Ipandas/_libs/src/klib -Ipandas/_libs/src -I/Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include -I/usr/local/include -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/sqlite/include -I/Users/g/ajudication/repos/mcp-data-mapping-utils/env/include -I/usr/local/opt/python@3.7/Frameworks/Python.framework/Versions/3.7/include/python3.7m -c pandas/_libs/algos.c -o build/temp.macosx-11.0-x86_64-3.7/pandas/_libs/algos.o -Wno-unused-function
  In file included from pandas/_libs/algos.c:567:
  In file included from /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/arrayobject.h:4:
  In file included from /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/ndarrayobject.h:12:
  In file included from /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/ndarraytypes.h:1822:
  /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/npy_1_7_deprecated_api.h:17:2: warning: &quot;Using deprecated NumPy API, disable it with &quot;          &quot;#define NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION&quot; [-W#warnings]
  #warning &quot;Using deprecated NumPy API, disable it with &quot; \
   ^
  1 warning generated.
  clang -bundle -undefined dynamic_lookup build/temp.macosx-11.0-x86_64-3.7/pandas/_libs/algos.o -L/usr/local/lib -L/usr/local/opt/openssl@1.1/lib -L/usr/local/opt/sqlite/lib -o build/lib.macosx-11.0-x86_64-3.7/pandas/_libs/algos.cpython-37m-darwin.so
  building 'pandas._libs.groupby' extension
  clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -I/Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -Ipandas/_libs/src/klib -Ipandas/_libs/src -I/Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include -I/usr/local/include -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/sqlite/include -I/Users/g/ajudication/repos/mcp-data-mapping-utils/env/include -I/usr/local/opt/python@3.7/Frameworks/Python.framework/Versions/3.7/include/python3.7m -c pandas/_libs/groupby.c -o build/temp.macosx-11.0-x86_64-3.7/pandas/_libs/groupby.o -Wno-unused-function
  In file included from pandas/_libs/groupby.c:567:
  In file included from /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/arrayobject.h:4:
  In file included from /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/ndarrayobject.h:12:
  In file included from /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/ndarraytypes.h:1822:
  /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/npy_1_7_deprecated_api.h:17:2: warning: &quot;Using deprecated NumPy API, disable it with &quot;          &quot;#define NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION&quot; [-W#warnings]
  #warning &quot;Using deprecated NumPy API, disable it with &quot; \
   ^
  pandas/_libs/groupby.c:27831:40: warning: self-comparison always evaluates to true [-Wtautological-compare]
              __pyx_t_24 = ((__pyx_v_val == __pyx_v_val) != 0);
                                         ^
  pandas/_libs/groupby.c:28616:40: warning: self-comparison always evaluates to true [-Wtautological-compare]
              __pyx_t_24 = ((__pyx_v_val == __pyx_v_val) != 0);
                                         ^
  3 warnings generated.
  clang -bundle -undefined dynamic_lookup build/temp.macosx-11.0-x86_64-3.7/pandas/_libs/groupby.o -L/usr/local/lib -L/usr/local/opt/openssl@1.1/lib -L/usr/local/opt/sqlite/lib -o build/lib.macosx-11.0-x86_64-3.7/pandas/_libs/groupby.cpython-37m-darwin.so
  building 'pandas._libs.hashing' extension
  clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -I/Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -Ipandas/_libs/src/klib -Ipandas/_libs/src -I/Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include -I/usr/local/include -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/sqlite/include -I/Users/g/ajudication/repos/mcp-data-mapping-utils/env/include -I/usr/local/opt/python@3.7/Frameworks/Python.framework/Versions/3.7/include/python3.7m -c pandas/_libs/hashing.c -o build/temp.macosx-11.0-x86_64-3.7/pandas/_libs/hashing.o -Wno-unused-function
  In file included from pandas/_libs/hashing.c:567:
  In file included from /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/arrayobject.h:4:
  In file included from /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/ndarrayobject.h:12:
  In file included from /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/ndarraytypes.h:1822:
  /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/npy_1_7_deprecated_api.h:17:2: warning: &quot;Using deprecated NumPy API, disable it with &quot;          &quot;#define NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION&quot; [-W#warnings]
  #warning &quot;Using deprecated NumPy API, disable it with &quot; \
   ^
  1 warning generated.
  clang -bundle -undefined dynamic_lookup build/temp.macosx-11.0-x86_64-3.7/pandas/_libs/hashing.o -L/usr/local/lib -L/usr/local/opt/openssl@1.1/lib -L/usr/local/opt/sqlite/lib -o build/lib.macosx-11.0-x86_64-3.7/pandas/_libs/hashing.cpython-37m-darwin.so
  building 'pandas._libs.hashtable' extension
  clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -I/Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -Ipandas/_libs/src/klib -Ipandas/_libs/src -I/Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include -I/usr/local/include -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/sqlite/include -I/Users/g/ajudication/repos/mcp-data-mapping-utils/env/include -I/usr/local/opt/python@3.7/Frameworks/Python.framework/Versions/3.7/include/python3.7m -c pandas/_libs/hashtable.c -o build/temp.macosx-11.0-x86_64-3.7/pandas/_libs/hashtable.o -Wno-unused-function
  In file included from pandas/_libs/hashtable.c:568:
  In file included from /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/arrayobject.h:4:
  In file included from /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/ndarrayobject.h:12:
  In file included from /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/ndarraytypes.h:1822:
  /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/npy_1_7_deprecated_api.h:17:2: warning: &quot;Using deprecated NumPy API, disable it with &quot;          &quot;#define NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION&quot; [-W#warnings]
  #warning &quot;Using deprecated NumPy API, disable it with &quot; \
   ^
  pandas/_libs/hashtable.c:14483:38: warning: self-comparison always evaluates to false [-Wtautological-compare]
            __pyx_t_15 = ((__pyx_v_val != __pyx_v_val) != 0);
                                       ^
  pandas/_libs/hashtable.c:18312:38: warning: self-comparison always evaluates to false [-Wtautological-compare]
            __pyx_t_15 = ((__pyx_v_val != __pyx_v_val) != 0);
                                       ^
  pandas/_libs/hashtable.c:20467:13: warning: assigning to 'char *' from 'const char *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
    __pyx_t_6 = get_c_string(__pyx_v_val); if (unlikely(__pyx_t_6 == ((char *)NULL))) __PYX_ERR(0, 1249, __pyx_L1_error)
              ^ ~~~~~~~~~~~~~~~~~~~~~~~~~
  pandas/_libs/hashtable.c:20696:13: warning: assigning to 'char *' from 'const char *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
    __pyx_t_8 = get_c_string(__pyx_t_1); if (unlikely(__pyx_t_8 == ((char *)NULL))) __PYX_ERR(0, 1263, __pyx_L1_error)
              ^ ~~~~~~~~~~~~~~~~~~~~~~~
  pandas/_libs/hashtable.c:21062:16: warning: assigning to 'char *' from 'const char *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
      __pyx_t_12 = get_c_string(__pyx_v_val); if (unlikely(__pyx_t_12 == ((char *)NULL))) __PYX_ERR(0, 1286, __pyx_L1_error)
                 ^ ~~~~~~~~~~~~~~~~~~~~~~~~~
  pandas/_libs/hashtable.c:21397:16: warning: assigning to 'char *' from 'const char *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
      __pyx_t_11 = get_c_string(__pyx_v_val); if (unlikely(__pyx_t_11 == ((char *)NULL))) __PYX_ERR(0, 1316, __pyx_L1_error)
                 ^ ~~~~~~~~~~~~~~~~~~~~~~~~~
  pandas/_libs/hashtable.c:22033:18: warning: assigning to 'char *' from 'const char *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
        __pyx_t_13 = get_c_string(__pyx_v_val); if (unlikely(__pyx_t_13 == ((char *)NULL))) __PYX_ERR(0, 1357, __pyx_L1_error)
                   ^ ~~~~~~~~~~~~~~~~~~~~~~~~~
  pandas/_libs/hashtable.c:22056:18: warning: assigning to 'char *' from 'const char *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
        __pyx_t_13 = get_c_string(__pyx_t_6); if (unlikely(__pyx_t_13 == ((char *)NULL))) __PYX_ERR(0, 1359, __pyx_L1_error)
                   ^ ~~~~~~~~~~~~~~~~~~~~~~~
  pandas/_libs/hashtable.c:22428:17: warning: assigning to 'char *' from 'const char *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
        __pyx_t_8 = get_c_string(__pyx_v_val); if (unlikely(__pyx_t_8 == ((char *)NULL))) __PYX_ERR(0, 1390, __pyx_L1_error)
                  ^ ~~~~~~~~~~~~~~~~~~~~~~~~~
  pandas/_libs/hashtable.c:22451:17: warning: assigning to 'char *' from 'const char *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
        __pyx_t_8 = get_c_string(__pyx_t_4); if (unlikely(__pyx_t_8 == ((char *)NULL))) __PYX_ERR(0, 1392, __pyx_L1_error)
                  ^ ~~~~~~~~~~~~~~~~~~~~~~~
  pandas/_libs/hashtable.c:22968:18: warning: assigning to 'char *' from 'const char *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
        __pyx_t_14 = get_c_string(__pyx_v_val); if (unlikely(__pyx_t_14 == ((char *)NULL))) __PYX_ERR(0, 1431, __pyx_L1_error)
                   ^ ~~~~~~~~~~~~~~~~~~~~~~~~~
  pandas/_libs/hashtable.c:27585:19: warning: comparison of integers of different signs: 'size_t' (aka 'unsigned long') and 'Py_ssize_t' (aka 'long') [-Wsign-compare]
    if (((__pyx_t_1 &lt; __pyx_t_2) != 0)) {
          ~~~~~~~~~ ^ ~~~~~~~~~
  pandas/_libs/hashtable.c:29631:39: warning: self-comparison always evaluates to false [-Wtautological-compare]
              __pyx_t_17 = (__pyx_v_val != __pyx_v_val);
                                        ^
  pandas/_libs/hashtable.c:29411:19: warning: comparison of integers of different signs: 'size_t' (aka 'unsigned long') and 'Py_ssize_t' (aka 'long') [-Wsign-compare]
    if (((__pyx_t_1 &lt; __pyx_t_2) != 0)) {
          ~~~~~~~~~ ^ ~~~~~~~~~
  pandas/_libs/hashtable.c:33087:39: warning: self-comparison always evaluates to false [-Wtautological-compare]
              __pyx_t_17 = (__pyx_v_val != __pyx_v_val);
                                        ^
  pandas/_libs/hashtable.c:32867:19: warning: comparison of integers of different signs: 'size_t' (aka 'unsigned long') and 'Py_ssize_t' (aka 'long') [-Wsign-compare]
    if (((__pyx_t_1 &lt; __pyx_t_2) != 0)) {
          ~~~~~~~~~ ^ ~~~~~~~~~
  17 warnings generated.
  clang -bundle -undefined dynamic_lookup build/temp.macosx-11.0-x86_64-3.7/pandas/_libs/hashtable.o -L/usr/local/lib -L/usr/local/opt/openssl@1.1/lib -L/usr/local/opt/sqlite/lib -o build/lib.macosx-11.0-x86_64-3.7/pandas/_libs/hashtable.cpython-37m-darwin.so
  building 'pandas._libs.index' extension
  creating build/temp.macosx-11.0-x86_64-3.7/pandas/_libs/src
  creating build/temp.macosx-11.0-x86_64-3.7/pandas/_libs/src/datetime
  clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -I/Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -Ipandas/_libs/src/klib -Ipandas/_libs/src -I/Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include -I/usr/local/include -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/sqlite/include -I/Users/g/ajudication/repos/mcp-data-mapping-utils/env/include -I/usr/local/opt/python@3.7/Frameworks/Python.framework/Versions/3.7/include/python3.7m -c pandas/_libs/index.c -o build/temp.macosx-11.0-x86_64-3.7/pandas/_libs/index.o -Wno-unused-function
  In file included from pandas/_libs/index.c:568:
  In file included from /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/arrayobject.h:4:
  In file included from /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/ndarrayobject.h:12:
  In file included from /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/ndarraytypes.h:1822:
  /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/npy_1_7_deprecated_api.h:17:2: warning: &quot;Using deprecated NumPy API, disable it with &quot;          &quot;#define NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION&quot; [-W#warnings]
  #warning &quot;Using deprecated NumPy API, disable it with &quot; \
   ^
  1 warning generated.
  clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -I/Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -Ipandas/_libs/src/klib -Ipandas/_libs/src -I/Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include -I/usr/local/include -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/sqlite/include -I/Users/g/ajudication/repos/mcp-data-mapping-utils/env/include -I/usr/local/opt/python@3.7/Frameworks/Python.framework/Versions/3.7/include/python3.7m -c pandas/_libs/src/datetime/np_datetime.c -o build/temp.macosx-11.0-x86_64-3.7/pandas/_libs/src/datetime/np_datetime.o -Wno-unused-function
  In file included from pandas/_libs/src/datetime/np_datetime.c:22:
  In file included from /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/arrayobject.h:4:
  In file included from /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/ndarrayobject.h:12:
  In file included from /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/ndarraytypes.h:1822:
  /Users/g/ajudication/repos/mcp-data-mapping-utils/env/lib/python3.7/site-packages/numpy/core/include/numpy/npy_1_7_deprecated_api.h:17:2: warning: &quot;Using deprecated NumPy API, disable it with &quot;          &quot;#define NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION&quot; [-W#warnings]
  #warning &quot;Using deprecated NumPy API, disable it with &quot; \
   ^
  pandas/_libs/src/datetime/np_datetime.c:518:5: error: implicit declaration of function 'convert_datetimestruct_to_datetime' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
      convert_datetimestruct_to_datetime(fr, d, &amp;result);
      ^
  pandas/_libs/src/datetime/np_datetime.c:518:5: note: did you mean 'pandas_datetimestruct_to_datetime'?
  pandas/_libs/src/datetime/np_datetime.c:514:14: note: 'pandas_datetimestruct_to_datetime' declared here
  npy_datetime pandas_datetimestruct_to_datetime(PANDAS_DATETIMEUNIT fr,
               ^
  pandas/_libs/src/datetime/np_datetime.c:530:5: error: implicit declaration of function 'convert_timedelta_to_timedeltastruct' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
      convert_timedelta_to_timedeltastruct(fr, val, result);
      ^
  pandas/_libs/src/datetime/np_datetime.c:530:5: note: did you mean 'pandas_timedelta_to_timedeltastruct'?
  pandas/_libs/src/datetime/np_datetime.c:527:6: note: 'pandas_timedelta_to_timedeltastruct' declared here
  void pandas_timedelta_to_timedeltastruct(npy_timedelta val,
       ^
  1 warning and 2 errors generated.
  error: command 'clang' failed with exit status 1
  ----------------------------------------
  ERROR: Command errored out with exit status 1: /Users/g/ajudication/repos/mcp-data-mapping-utils/env/bin/python3.7 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '&quot;'&quot;'/private/var/folders/yq/7j7wbssx4_98c2g9y4_sqsvc0000gp/T/pip-install-o9kr4joa/pandas/setup.py'&quot;'&quot;'; __file__='&quot;'&quot;'/private/var/folders/yq/7j7wbssx4_98c2g9y4_sqsvc0000gp/T/pip-install-o9kr4joa/pandas/setup.py'&quot;'&quot;';f=getattr(tokenize, '&quot;'&quot;'open'&quot;'&quot;', open)(__file__);code=f.read().replace('&quot;'&quot;'\r\n'&quot;'&quot;', '&quot;'&quot;'\n'&quot;'&quot;');f.close();exec(compile(code, __file__, '&quot;'&quot;'exec'&quot;'&quot;'))' install --record /private/var/folders/yq/7j7wbssx4_98c2g9y4_sqsvc0000gp/T/pip-record-g6msurvw/install-record.txt --single-version-externally-managed --compile --install-headers /Users/g/ajudication/repos/mcp-data-mapping-utils/env/include/site/python3.7/pandas Check the logs for full command output. 
  </code></pre>
  <p>Looks like it's something with <code>clang</code>. However I'm not entirely sure.</p>
  <p>Error: <code>error: command 'clang' failed with exit status 1</code></p>
  <p>So far I've reinstalled xcode and xcode-select. I'm also running python 3.7.9 in a virtual environment.</p>