pip install が出来ない

Question

pip install が出来ずに困っています．

形態素解析ツールのSudachiをインストールしようとしています．
pip install SudichiPy を実行したところ，以下のようなエラーメッセージが出ました．

エラーメッセージ

Installing collected packages: sortedcontainers, Cython, dartsclone, SudachiPy
    Running setup.py install for dartsclone ... error
    ERROR: Command errored out with exit status 1:
     command: /Users/ユーザ名/.pyenv/versions/anaconda3-5.1.0/envs/仮想環境名/bin/python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/81/m106tnls6k1dfkcc0y7q67480000gn/T/pip-install-aod9fsz7/dartsclone/setup.py'"'"'; __file__='"'"'/private/var/folders/81/m106tnls6k1dfkcc0y7q67480000gn/T/pip-install-aod9fsz7/dartsclone/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/81/m106tnls6k1dfkcc0y7q67480000gn/T/pip-record-y_5a6o_9/install-record.txt --single-version-externally-managed --compile
         cwd: /private/var/folders/81/m106tnls6k1dfkcc0y7q67480000gn/T/pip-install-aod9fsz7/dartsclone/
    Complete output (25 lines):
    running install
    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/dartsclone
    copying dartsclone/__init__.py -> build/lib.macosx-10.7-x86_64-3.6/dartsclone
    running build_ext
    cythoning dartsclone/_dartsclone.pyx to dartsclone/_dartsclone.cpp
    /Users/ユーザ名/.pyenv/versions/anaconda3-5.1.0/envs/仮想環境名/lib/python3.6/site-packages/Cython/Compiler/Main.py:369: FutureWarning: Cython directive 'language_level' not set, using 2 for now (Py2). This will change in a later release! File: /private/var/folders/81/m106tnls6k1dfkcc0y7q67480000gn/T/pip-install-aod9fsz7/dartsclone/dartsclone/_dartsclone.pxd
      tree = Parsing.p_module(s, pxd, full_module_name)
    warning: dartsclone/_dartsclone.pyx:119:49: local variable 'result' referenced before assignment
    warning: dartsclone/_dartsclone.pyx:120:15: local variable 'result' referenced before assignment
    building 'dartsclone._dartsclone' extension
    creating build/temp.macosx-10.7-x86_64-3.6
    creating build/temp.macosx-10.7-x86_64-3.6/dartsclone
    creating build/temp.macosx-10.7-x86_64-3.6/csrc
    creating build/temp.macosx-10.7-x86_64-3.6/csrc/src
    gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/Users/ユーザ名/.pyenv/versions/anaconda3-5.1.0/envs/仮想環境名/include -arch x86_64 -I/Users/ユーザ名/.pyenv/versions/anaconda3-5.1.0/envs/仮想環境名/include -arch x86_64 -I./csrc/include -I/Users/ユーザ名/.pyenv/versions/anaconda3-5.1.0/envs/仮想環境名/include/python3.6m -c dartsclone/_dartsclone.cpp -o build/temp.macosx-10.7-x86_64-3.6/dartsclone/_dartsclone.o
    warning: include path for stdlibc++ headers not found; pass '-stdlib=libc++' on the command line to use the libc++ standard library instead [-Wstdlibcxx-not-found]
    dartsclone/_dartsclone.cpp:610:10: fatal error: 'ios' file not found
    #include "ios"
             ^~~~~
    1 warning and 1 error generated.
    error: command 'gcc' failed with exit status 1
    ----------------------------------------
ERROR: Command errored out with exit status 1: /Users/ユーザ名/.pyenv/versions/anaconda3-5.1.0/envs/仮想環境名/bin/python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/81/m106tnls6k1dfkcc0y7q67480000gn/T/pip-install-aod9fsz7/dartsclone/setup.py'"'"'; __file__='"'"'/private/var/folders/81/m106tnls6k1dfkcc0y7q67480000gn/T/pip-install-aod9fsz7/dartsclone/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/81/m106tnls6k1dfkcc0y7q67480000gn/T/pip-record-y_5a6o_9/install-record.txt --single-version-externally-managed --compile Check the logs for full command output.

試したこと

以下の記事を参考にxcodeのセットアップツールをインストールしました．

xcode-select: error: command line tools are already installed, use "Software Update" to install updates

補足情報（FW/ツールのバージョンなど）

macOS Mojave(10.14.6)
Python3.6
anaconda3.5.1.0
pyenv1.2.11
pip19.3.1
Xcode11.2

Answer 1

setuptoolを入れ直したらなんとかなりました

参考：https://qiita.com/miyamotok0105/items/55a828070b6d6abc1a7c#setup-tool

具体的には，
curl https://bootstrap.pypa.io/ez_setup.py -o - | python
pip install --upgrade setuptools

を実行するとpip installができるようになりました．(詳細は不明)