Error when trying to install.

Tried to install Instapy. When it could not, it suggested I share my error message here. Please advise.

ERROR: Command errored out with exit status 1:
command: /Library/Frameworks/Python.framework/Versions/3.8/bin/python3.8 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/ls/n78nsrps7g11kns59t2n659r0000gn/T/pip-install-wpcpf65p/regex/setup.py'"'"'; __file__='"'"'/private/var/folders/ls/n78nsrps7g11kns59t2n659r0000gn/T/pip-install-wpcpf65p/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/var/folders/ls/n78nsrps7g11kns59t2n659r0000gn/T/pip-record-2l2xt1fm/install-record.txt --single-version-externally-managed --compile --install-headers /Library/Frameworks/Python.framework/Versions/3.8/include/python3.8/regex
cwd: /private/var/folders/ls/n78nsrps7g11kns59t2n659r0000gn/T/pip-install-wpcpf65p/regex/
Complete output (17 lines):
running install
running build
running build_py
creating build
creating build/lib.macosx-10.9-x86_64-3.8
creating build/lib.macosx-10.9-x86_64-3.8/regex
copying regex_3/__init__.py -> build/lib.macosx-10.9-x86_64-3.8/regex
copying regex_3/regex.py -> build/lib.macosx-10.9-x86_64-3.8/regex
copying regex_3/_regex_core.py -> build/lib.macosx-10.9-x86_64-3.8/regex
copying regex_3/test_regex.py -> build/lib.macosx-10.9-x86_64-3.8/regex
running build_ext
building 'regex._regex' extension
creating build/temp.macosx-10.9-x86_64-3.8
creating build/temp.macosx-10.9-x86_64-3.8/regex_3
gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -I/Library/Frameworks/Python.framework/Versions/3.8/include/python3.8 -c regex_3/_regex.c -o build/temp.macosx-10.9-x86_64-3.8/regex_3/_regex.o
xcode-select: note: no developer tools were found at '/Applications/Xcode.app', requesting install. Choose an option in the dialog to download the command line developer tools.
error: command 'gcc' failed with exit status 1
----------------------------------------
ERROR: Command errored out with exit status 1: /Library/Frameworks/Python.framework/Versions/3.8/bin/python3.8 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/ls/n78nsrps7g11kns59t2n659r0000gn/T/pip-install-wpcpf65p/regex/setup.py'"'"'; __file__='"'"'/private/var/folders/ls/n78nsrps7g11kns59t2n659r0000gn/T/pip-install-wpcpf65p/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/var/folders/ls/n78nsrps7g11kns59t2n659r0000gn/T/pip-record-2l2xt1fm/install-record.txt --single-version-externally-managed --compile --install-headers /Library/Frameworks/Python.framework/Versions/3.8/include/python3.8/regex Check the logs for full command output.

報告では、macOS 上の Python 3.8 で pip が regex/setup.py から regex をビルドし、その後 gcc と Xcode command-line tools が存在しないために失敗するとされています。まずプロジェクトのインストール手順と依存関係の設定を確認し、pip install を再現して、このビルドエラーなしにドキュメントに記載されたインストールが完了した場合にのみ、問題が解決したとみなしてください。

索引モデルが issue の本文から書いたものです。