Yes! I found the problem!..
Some time ago I changed domain name of my server.
Now I look at config.php and see old domain. I fix it, restart php-fpm and reload tt-rss page in browser. Now problem feed is successfully added.
Great. Glad the issue is resolved. Turns out to not be a curl/SSL issue after all.
i thought there was a check for this 
I think just for HTTP(S) scheme.
https://git.tt-rss.org/git/tt-rss/commit/7506b61af259f24456ea44c2c31a915c634f0c5e
e: in other news looks like phpstorm indents shit with spaces silently now, thanks jetbrains
… to data returned by httpd
If it would help, I use nginx
curl shouldn’t be in /usr
It’s Gentoo, which I have never used; so I made no assumptions.
:shrug:
fair enough… but even gentoo should have binaries in /usr/bin
It is there… https://i.imgur.com/T5B3NwL.png
‘–with-curl=/usr’ is just build constant, not path to curl