python3.8.0　アップデートできない

python3.8.0のダウンロードをしたいのですが以下のようなエラーがでて、できません。
助けてくださいよろしくお願いします。

python-build: use openssl@1.1 from homebrew
python-build: use readline from homebrew
Downloading Python-3.8.0.tar.xz...
-> https://www.python.org/ftp/python/3.8.0/Python-3.8.0.tar.xz
Installing Python-3.8.0...
python-build: use readline from homebrew

BUILD FAILED (OS X 10.15.7 using python-build 20180424)

Inspect or clean up the working tree at /var/folders/p9/nwgxrl157kxbqt577_xpwq2m0000gn/T/python-build.20201107150955.11772
Results logged to /var/folders/p9/nwgxrl157kxbqt577_xpwq2m0000gn/T/python-build.20201107150955.11772.log

Last 10 log lines:
checking for python3... python3
checking for --enable-universalsdk... no
checking for --with-universal-archs... no
checking MACHDEP... "darwin"
checking for gcc... clang
checking whether the C compiler works... no
configure: error: in /var/folders/p9/nwgxrl157kxbqt577_xpwq2m0000gn/T/python-build.20201107150955.11772/Python-3.8.0':
configure: error: C compiler cannot create executables
Seeconfig.log' for more details
xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun