https://bugs.gentoo.org/950339
https://gitlab.gnome.org/GNOME/gnome-robots/-/issues/19
https://gitlab.gnome.org/GNOME/gnome-robots/-/commit/f34f794554f6091071435874a18e1c39696e4d24

From f34f794554f6091071435874a18e1c39696e4d24 Mon Sep 17 00:00:00 2001
From: Dominique Leuenberger <dimstar@opensuse.org>
Date: Thu, 2 May 2024 17:54:50 +0200
Subject: [PATCH] build: Link against libm

Fixes build in case none of our dependenices adds -lm to LDFLAGS.
Since gnome-robot's own code uses atan2, it is our own responsibility
to ensure the linking against libm.

Fixes https://gitlab.gnome.org/GNOME/gnome-robots/-/issues/19
--- a/meson.build
+++ b/meson.build
@@ -22,6 +22,9 @@ gtk_dependency = dependency('gtk+-3.0', version: '>= 3.24.0')
 gdk_dependency = dependency('gdk-3.0', version: '>= 3.24.0')
 rsvg_dependency = dependency('librsvg-2.0', version: '>= 2.36.2')
 
+cc = meson.get_compiler('c')
+m_dep = cc.find_library('m', required : false)
+
 bindir      = join_paths(get_option('prefix'), get_option('bindir'))
 datadir     = join_paths(get_option('prefix'), get_option('datadir'))
 pkgdatadir  = join_paths(datadir, meson.project_name())
--- a/src/meson.build
+++ b/src/meson.build
@@ -53,7 +53,8 @@ executable(
         gsound_dependency,
         gtk_dependency,
         gdk_dependency,
-        rsvg_dependency
+        rsvg_dependency,
+        m_dep
     ],
     install_dir: get_option('bindir'),
     install: true