pyenvでPython 3.4.3をインストールしようとしたらこんなエラーが出た.

Downloading Python-3.4.3.tar.xz...
-> https://www.python.org/ftp/python/3.4.3/Python-3.4.3.tar.xz
Installing Python-3.4.3...
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 (Ubuntu 18.04 using python-build 1.2.12-2-geb68ec94)

Inspect or clean up the working tree at /tmp/python-build.20190629080825.2203
Results logged to /tmp/python-build.20190629080825.2203.log

Last 10 log lines:
(cd /home/5ebec/.anyenv/envs/pyenv/versions/3.4.3/share/man/man1; ln -s python3.4.1 python3.1)
if test "xupgrade" != "xno"  ; then \
	case upgrade in \
		upgrade) ensurepip="--upgrade" ;; \
		install|*) ensurepip="" ;; \
	esac; \
	 ./python -E -m ensurepip \
		$ensurepip --root=/ ; \
fi
Ignoring ensurepip failure: pip 6.0.8 requires SSL/TLS

エラーメッセージに書かれている https://github.com/pyenv/pyenv/wiki/common-build-problems にこんな項目があった.

ERROR: The Python ssl extension was not compiled. Missing the OpenSSL lib?

If you’re having trouble to get it to compile older python versions(<3.5) even after installing the recommended packages on ubuntu, changing the openssl lib might help:

sudo apt-get remove libssl-dev
sudo apt-get update
sudo apt-get install libssl1.0-dev

これっぽい.

以下を実行

sudo apt remove libssl-dev
sudo apt update
sudo apt install libssl1.0-dev

再びpyenv install 3.4.3をしてみる

Downloading Python-3.4.3.tar.xz...
-> https://www.python.org/ftp/python/3.4.3/Python-3.4.3.tar.xz
Installing Python-3.4.3...
Installed Python-3.4.3 to /home/5ebec/.anyenv/envs/pyenv/versions/3.4.3

解決.