emacs-29: let*: Symbol’s function definition is void: \(setf\ compat-alist-get\) with Magit

[Yasushi SHOJI]

Hi,

I'm getting the following message with the emacs-29 branch when I
magit-section-toggle on a modified file on a Magit buffer to show the
difference.

    let*: Symbol’s function definition is void: \(setf\ compat-alist-get\)

I've bisected Emacs and it shows that the following change is
the one to cause this.

> commit fb87d5008e2 (HEAD)
> Author: Philip Kaludercic <philipk@posteo.net>
> Date:   Thu Aug 11 13:35:47 2022 +0200
>
>     * package.el (package--get-activatable-pkg): Prefer source packages

But I'm not sure why.  Does anyone see this?

I'm building Emacs with the following command:
/autogen.sh && ./configure --without-native-compilation --with-pgtk
--with-tree-sitter && make -j src lisp

Magit 20230116.2312 [>= 3.3.0.50-git], Git 2.39.0, Emacs 29.0.50, gnu/linux

Best
-- 
        yashi