global-linum-mode causes error in Emacs 30.1

[PoulLorca]

I'm using Ubuntu 24.04.2 LTS with Emacs version 30.1. After following the setup instructions from the Clojure for the Brave and True book, I downloaded and installed the emacs-for-clojure-book1 configuration by moving it to ~/.emacs.d.

However, when I launch Emacs, I receive the following error during initialization:

⛔ Warning (initialization): An error occurred while loading ‘/home/xxxx/.emacs.d/init.el’:

Symbol's function definition is void: global-linum-mode

Root cause:

The error comes from the file customizations/ui.el, which includes the line:

(global-linum-mode t)

This function was removed in Emacs 29.1, and it no longer exists in Emacs 30.1 and later. As a result, the configuration fails to load properly on modern Emacs versions.

Proposed fix:

To restore compatibility with Emacs 29.1+ and 30.1, please replace:

(global-linum-mode t)

with:

(global-display-line-numbers-mode t)

Suggestion:

It would be great to update the repository to support newer versions of Emacs, or at least add a note in the README indicating that the current configuration is only compatible with Emacs versions prior to 29.1.

Thanks for this great resource — I hope this helps others using modern environments!

[lashomb]

Ran into this as well.

[mtamazlicaru]

Found a solution for this here.