Pyenv installs fine, but won't add a Python version?

[PsiMation]

When trying to install a version of Python using pyenv, I get the following error below. I have gcc installed via Xcode. Can anyone point me in a direction to find the cause please?

pyenv install 3.9.0
python-build: use [email protected] from homebrew
python-build: use readline from homebrew
Downloading Python-3.9.0.tar.xz...
-> https://www.python.org/ftp/python/3.9.0/Python-3.9.0.tar.xz
Installing Python-3.9.0...
python-build: use readline from homebrew
python-build: use zlib from xcode sdk

BUILD FAILED (OS X 11.6 using python-build 20180424)

Inspect or clean up the working tree at /var/folders/_3/3n7g_jr918v2cj_pkdlfk5t40000gn/T/python-build.20211010191505.67494
Results logged to /var/folders/_3/3n7g_jr918v2cj_pkdlfk5t40000gn/T/python-build.20211010191505.67494.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/_3/3n7g_jr918v2cj_pkdlfk5t40000gn/T/python-build.20211010191505.67494/Python-3.9.0': configure: error: C compiler cannot create executables See config.log' for more details
make: *** No targets specified and no makefile found. Stop.

[hitblast]

It can either be the fact that you have an old version of Command Line Tools for Xcode installed, or you might not have accepted Xcode's license agreement. This can be fixed with the following command:

$ sudo gcc
You have not agreed to the Xcode license agreements. You must agree to both license agreements below in order to use Xcode.
[...]

If this doesn't fix the issue, then you might have to proceed with upgrading your Command Line Tools through the terminal or through System Preferences > Software Update respectively.

$ xcode-select --install

A similar issue can be noted on Mac OSX 10.8 in this StackOverflow question identical to what you've experienced.