You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.

gen-autoconf
2.6.8

This version was deleted from PyPI around 2023-12-23. Installing fails with:
$ pip3 install gen-autoconf==2.6.8 ERROR: Could not find a version that satisfies the requirement gen-autoconf==2.6.8
View other deleted versions of gen-autoconf

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2023-12-22/ \ gen-autoconf==2.6.8
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)

Or, download files manually

And install manually via pip:
gen_autoconf-2.6.8-py3-none-any.whl (30.0KB)
gen_autoconf-2.6.8.tar.gz (24.7KB)