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The scheme failed with ‘command’ failed

PIP install pylibmc installation failure and its solution. During installation, the following errors are reported, and there may be other errors, similar to the following:

pip install pylibmc==1.6.1
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
Collecting pylibmc==1.6.1
  Using cached https://pypi.tuna.tsinghua.edu.cn/packages/a7/0c/f7a3af34b05c167a69ed1fc330b06b658dac4ab25b8632c52d1022dd5337/pylibmc-1.6.1.tar.gz (64 kB)
Building wheels for collected packages: pylibmc
  Building wheel for pylibmc (setup.py) ... error
  ERROR: Command errored out with exit status 1:
   command: /Users/yangchangjia/PycharmProjects/Nox/venv/bin/python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/x7/zprpyfhx3h3g5qs3c_z_gxqc0000gn/T/pip-install-14fh8zn_/pylibmc/setup.py'"'"'; __file__='"'"'/private/var/folders/x7/zprpyfhx3h3g5qs3c_z_gxqc0000gn/T/pip-install-14fh8zn_/pylibmc/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/x7/zprpyfhx3h3g5qs3c_z_gxqc0000gn/T/pip-wheel-73t1n0ft
       cwd: /private/var/folders/x7/zprpyfhx3h3g5qs3c_z_gxqc0000gn/T/pip-install-14fh8zn_/pylibmc/
  Complete output (28 lines):
  /private/var/folders/x7/zprpyfhx3h3g5qs3c_z_gxqc0000gn/T/pip-install-14fh8zn_/pylibmc/setup.py:98: DeprecationWarning: 'U' mode is deprecated
    with open("README.rst", "U", encoding="utf-8") as r:
  /private/var/folders/x7/zprpyfhx3h3g5qs3c_z_gxqc0000gn/T/pip-install-14fh8zn_/pylibmc/setup.py:100: DeprecationWarning: 'U' mode is deprecated
    with open("src/pylibmc-version.h", "U", encoding="utf-8") as r:
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build/lib.macosx-10.15-x86_64-3.8
  creating build/lib.macosx-10.15-x86_64-3.8/pylibmc
  copying src/pylibmc/autoconf.py -> build/lib.macosx-10.15-x86_64-3.8/pylibmc
  copying src/pylibmc/pools.py -> build/lib.macosx-10.15-x86_64-3.8/pylibmc
  copying src/pylibmc/client.py -> build/lib.macosx-10.15-x86_64-3.8/pylibmc
  copying src/pylibmc/__init__.py -> build/lib.macosx-10.15-x86_64-3.8/pylibmc
  copying src/pylibmc/test.py -> build/lib.macosx-10.15-x86_64-3.8/pylibmc
  copying src/pylibmc/consts.py -> build/lib.macosx-10.15-x86_64-3.8/pylibmc
  copying src/pylibmc/__main__.py -> build/lib.macosx-10.15-x86_64-3.8/pylibmc
  running build_ext
  building '_pylibmc' extension
  creating build/temp.macosx-10.15-x86_64-3.8
  creating build/temp.macosx-10.15-x86_64-3.8/src
  clang -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include -DUSE_ZLIB -I/Users/yangchangjia/PycharmProjects/Nox/venv/include -I/Users/yangchangjia/.pyenv/versions/3.8.6/include/python3.8 -c src/_pylibmcmodule.c -o build/temp.macosx-10.15-x86_64-3.8/src/_pylibmcmodule.o -fno-strict-aliasing -std=c99
  In file included from src/_pylibmcmodule.c:34:
  src/_pylibmcmodule.h:42:10: fatal error: 'libmemcached/memcached.h' file not found
  #include <libmemcached/memcached.h>
           ^~~~~~~~~~~~~~~~~~~~~~~~~~
  1 error generated.
  error: command 'clang' failed with exit status 1
  ----------------------------------------
  ERROR: Failed building wheel for pylibmc
  Running setup.py clean for pylibmc
Failed to build pylibmc
Installing collected packages: pylibmc
    Running setup.py install for pylibmc ... error
    ERROR: Command errored out with exit status 1:
     command: /Users/yangchangjia/PycharmProjects/Nox/venv/bin/python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/x7/zprpyfhx3h3g5qs3c_z_gxqc0000gn/T/pip-install-14fh8zn_/pylibmc/setup.py'"'"'; __file__='"'"'/private/var/folders/x7/zprpyfhx3h3g5qs3c_z_gxqc0000gn/T/pip-install-14fh8zn_/pylibmc/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/x7/zprpyfhx3h3g5qs3c_z_gxqc0000gn/T/pip-record-tox14kc6/install-record.txt --single-version-externally-managed --compile --install-headers /Users/yangchangjia/PycharmProjects/Nox/venv/include/site/python3.8/pylibmc
         cwd: /private/var/folders/x7/zprpyfhx3h3g5qs3c_z_gxqc0000gn/T/pip-install-14fh8zn_/pylibmc/
    Complete output (28 lines):
    /private/var/folders/x7/zprpyfhx3h3g5qs3c_z_gxqc0000gn/T/pip-install-14fh8zn_/pylibmc/setup.py:98: DeprecationWarning: 'U' mode is deprecated
      with open("README.rst", "U", encoding="utf-8") as r:
    /private/var/folders/x7/zprpyfhx3h3g5qs3c_z_gxqc0000gn/T/pip-install-14fh8zn_/pylibmc/setup.py:100: DeprecationWarning: 'U' mode is deprecated
      with open("src/pylibmc-version.h", "U", encoding="utf-8") as r:
    running install
    running build
    running build_py
    creating build
    creating build/lib.macosx-10.15-x86_64-3.8
    creating build/lib.macosx-10.15-x86_64-3.8/pylibmc
    copying src/pylibmc/autoconf.py -> build/lib.macosx-10.15-x86_64-3.8/pylibmc
    copying src/pylibmc/pools.py -> build/lib.macosx-10.15-x86_64-3.8/pylibmc
    copying src/pylibmc/client.py -> build/lib.macosx-10.15-x86_64-3.8/pylibmc
    copying src/pylibmc/__init__.py -> build/lib.macosx-10.15-x86_64-3.8/pylibmc
    copying src/pylibmc/test.py -> build/lib.macosx-10.15-x86_64-3.8/pylibmc
    copying src/pylibmc/consts.py -> build/lib.macosx-10.15-x86_64-3.8/pylibmc
    copying src/pylibmc/__main__.py -> build/lib.macosx-10.15-x86_64-3.8/pylibmc
    running build_ext
    building '_pylibmc' extension
    creating build/temp.macosx-10.15-x86_64-3.8
    creating build/temp.macosx-10.15-x86_64-3.8/src
    clang -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include -DUSE_ZLIB -I/Users/yangchangjia/PycharmProjects/Nox/venv/include -I/Users/yangchangjia/.pyenv/versions/3.8.6/include/python3.8 -c src/_pylibmcmodule.c -o build/temp.macosx-10.15-x86_64-3.8/src/_pylibmcmodule.o -fno-strict-aliasing -std=c99
    In file included from src/_pylibmcmodule.c:34:
    src/_pylibmcmodule.h:42:10: fatal error: 'libmemcached/memcached.h' file not found
    #include <libmemcached/memcached.h>
             ^~~~~~~~~~~~~~~~~~~~~~~~~~
    1 error generated.
    error: command 'clang' failed with exit status 1
    ----------------------------------------
ERROR: Command errored out with exit status 1: /Users/yangchangjia/PycharmProjects/Nox/venv/bin/python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/x7/zprpyfhx3h3g5qs3c_z_gxqc0000gn/T/pip-install-14fh8zn_/pylibmc/setup.py'"'"'; __file__='"'"'/private/var/folders/x7/zprpyfhx3h3g5qs3c_z_gxqc0000gn/T/pip-install-14fh8zn_/pylibmc/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/x7/zprpyfhx3h3g5qs3c_z_gxqc0000gn/T/pip-record-tox14kc6/install-record.txt --single-version-externally-managed --compile --install-headers /Users/yangchangjia/PycharmProjects/Nox/venv/include/site/python3.8/pylibmc Check the logs for full command output.

Solution:

brew install libmemcached
pip install wheel
pip install pylibmc

Installation successful:

pip install pylibmc
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
Collecting pylibmc
  Using cached https://pypi.tuna.tsinghua.edu.cn/packages/a7/0c/f7a3af34b05c167a69ed1fc330b06b658dac4ab25b8632c52d1022dd5337/pylibmc-1.6.1.tar.gz (64 kB)
Building wheels for collected packages: pylibmc
  Building wheel for pylibmc (setup.py) ... done
  Created wheel for pylibmc: filename=pylibmc-1.6.1-cp38-cp38-macosx_10_15_x86_64.whl size=33323 sha256=9a8ecb4933b8a455b7ffe9db042011f3a9865c18441b8e5204d843bc0e6da1a3
  Stored in directory: /Users/yangchangjia/Library/Caches/pip/wheels/a1/8e/7e/d1b6684901c01de15a45efb8b5172c1dc7b9c6a7386d369839
Successfully built pylibmc
Installing collected packages: pylibmc
Successfully installed pylibmc-1.6.1