Showing wrong version Linux

You most probably used an older source code or a wrong revision.
It's best to do a checkout from the repo that guide links in the top and build from that - it'll result a correct revision info printed as well.
It shoud show "This hub is running ADCH++ 3.0.1 (r"ec462716f140 - 2022-05-18 17:50 +0200") Release" then.

I just tried it again but with hg instead of downloading the source from the main page.

hg clone http://hg.code.sf.net/p/adchpp/code adchpp-code
"Following the guide here"
But it still says "3.0.0 (r"[unknown]") Release running, press ctrl-c to exit..."
"This hub is running ADCH++ 3.0.0 (r"[unknown]") Release"

$ls -lh
2.1M Jun 9 13:32 adchppd

Description: Ubuntu 20.04.4 LTS
Release: 20.04
Codename: focal

The first couple of times i got the source from the main page adchpp.sourceforge.io -> "Download: Source Code"

Try the dev hub where people with experience of compiation under Linux may able to help. adcs://hub.dcbase.org:16591 , ask for registration to be able to chat.

https://sourceforge.net/p/adchpp/code/ci/default/tree/

Use "Download Snapshot" link on the top. . It will take some time but it will get the files you need.
Just tested it and i got correct 3.0.1 version this way.
I updated that dchublist.org guide as well. Yeah something isnt quite right on that download page, but snapshot works.

Thank you Derek, i still get "(r"[unknown]") Release" but atleast it shows the correct version now by displaying 3.0.1
"This hub is running ADCH++ 3.0.1 (r"[unknown]") Release"

Thank you all! :)

Do you have mercurial installed?
If so its a bug in adch++ else install it and see if release number is generated.

Yes I had mercurial installed the whole time.

$apt-get install
shows
"mercurial is already the newest version (5.3.1-1ubuntu1)."

You have to compile inside from a valid local checkout to have the call to mercurial successfully get the revision number during the compilaton.