Can't install Python 3.6.15 on OSX 10.15.7

[Stratus3D]

When I try installing Python 3.6.15 on OSX 10.15.7 it fails:

asdf install python 3.6.15 
python-build 3.6.15 /Users/trevorbrown/.asdf/installs/python/3.6.15
python-build: use [email protected] from homebrew
python-build: use readline from homebrew
Downloading Python-3.6.15.tar.xz...
-> https://www.python.org/ftp/python/3.6.15/Python-3.6.15.tar.xz
Installing Python-3.6.15...
python-build: use tcl-tk from homebrew
python-build: use readline from homebrew
python-build: use zlib from xcode sdk
ERROR: The Python ssl extension was not compiled. Missing the OpenSSL lib?

Please consult to the Wiki page to fix the problem.
https://github.com/pyenv/pyenv/wiki/Common-build-problems


BUILD FAILED (OS X 10.15.7 using python-build 2.0.6-14-ge56962b3)

Inspect or clean up the working tree at /var/folders/7m/9bq62tmj60zf14d788w0lk8c0000gp/T/python-build.20210917113737.35119
Results logged to /var/folders/7m/9bq62tmj60zf14d788w0lk8c0000gp/T/python-build.20210917113737.35119.log

Last 10 log lines:
			install|*) ensurepip="" ;; \
		esac; \
		 ./python.exe -E -m ensurepip \
			$ensurepip --root=/ ; \
	fi
Looking in links: /var/folders/7m/9bq62tmj60zf14d788w0lk8c0000gp/T/tmpimujpeip
Collecting setuptools
Collecting pip
Installing collected packages: setuptools, pip
Successfully installed pip-18.1 setuptools-40.6.2

It's not clear to me from the error message and the logs what failed. Installing Python 3.6.13 however succeeds:

asdf install python 3.6.13 
python-build 3.6.13 /Users/trevorbrown/.asdf/installs/python/3.6.13
python-build: use [email protected] from homebrew
python-build: use readline from homebrew
Downloading Python-3.6.13.tar.xz...
-> https://www.python.org/ftp/python/3.6.13/Python-3.6.13.tar.xz
Installing Python-3.6.13...
python-build: use tcl-tk from homebrew
python-build: use readline from homebrew
python-build: use zlib from xcode sdk
Installed Python-3.6.13 to /Users/trevorbrown/.asdf/installs/python/3.6.13

Output from asdf info:

OS:
Darwin it-mbp-trevorbrown.home 19.6.0 Darwin Kernel Version 19.6.0: Tue Jun 22 19:49:55 PDT 2021; root:xnu-6153.141.35~1/RELEASE_X86_64 x86_64

SHELL:
zsh 5.7.1 (x86_64-apple-darwin19.0)

ASDF VERSION:
v0.8.1-7e1f2a0

ASDF ENVIRONMENT VARIABLES:
ASDF_DIR=/Users/trevorbrown/.asdf

ASDF INSTALLED PLUGINS:
clojure                      https://github.com/halcyon/asdf-clojure.git master c6125ab
elasticsearch                https://github.com/asdf-community/asdf-elasticsearch.git master b908f32
elixir                       ssh://[email protected]/asdf-vm/asdf-elixir.git master 63e9cd8
erlang                       [email protected]:asdf-vm/asdf-erlang.git better-logging b90f3ee
java                         https://github.com/halcyon/asdf-java.git master b050643
kafka                        [email protected]:JoshAshby/asdf-kafka.git master 6c8660a
lua                          [email protected]:Stratus3D/asdf-lua.git master ef66ab8
nodejs                       ssh://[email protected]/asdf-vm/asdf-nodejs.git master 95a2091
postgres                     https://github.com/smashedtoatoms/asdf-postgres.git master 2fa062b
python                       https://github.com/tuvistavie/asdf-python.git master 57a4d72
rebar                        https://github.com/Stratus3D/asdf-rebar.git master f3aa004
ruby                         [email protected]:asdf-vm/asdf-ruby.git charlesbjohnson-charlesbjohnson/gemfile-parsing 606cb83
yarn                         https://github.com/twuni/asdf-yarn.git master 5525eb2