Prior to creating an issue, please review the troubleshooting documentation:
http://pycurl.io/docs/dev/troubleshooting.html
I did research for some time.

What did you try to do?

I try to find what the problem is. I try to install several Python version to check if it work with pycurl.

What happened?

And the Python 3.6 is working well currently. It install pycurl 7.43.0.5 when I use "pip install" command. When I try to install the lastest pycurl version, it give me the ERROR: Command errored out with exit status 10:

Another error when I try to install this with Python 3.9: https://www.lfd.uci.edu/~gohlke/pythonlibs/#pycurl
pycurl: libcurl link-time ssl backends (schannel) do not include compile-time ssl backend (openssl)

What did you expect to happen?

I would like to install pycurl on Python 3.9 smoothly.

What is the PycURL version?

7.43.0.5

What is your Python version?

3.9

What is your operating system and its version?

Windows 10 ( Lastest version )

Other versions

If your report references any software besides PycURL, for example pip,
what are the versions of this software? (pip --version, etc.)

pip 21.3

Is this the most recent PycURL release?

Yes it is.