fix

docs/default.nix

@@ -106,7 +106,7 @@ in
 
     installPhase = ''
       runHook preInstall
-      ${genLib "astal" "" "Astal core library" {
+      ${genLib "astal" "" {
         out = "libastal";
         description = "Astal core library";
         version = ../core/version;

lib/battery/meson.build

@@ -32,12 +32,14 @@ config = configure_file(
   },
 )
 
-deps = [
+pkgconfig_deps = [
   dependency('glib-2.0'),
   dependency('gio-2.0'),
   dependency('gobject-2.0'),
 ]
 
+deps = pkgconfig_deps + meson.get_compiler('c').find_library('m')
+
 sources = [
   config,
   'ifaces.vala',
@@ -64,7 +66,7 @@ if get_option('lib')
     filebase: meson.project_name() + '-' + api_version,
     version: meson.project_version(),
     subdirs: meson.project_name(),
-    requires: deps,
+    requires: pkgconfig_deps,
     install_dir: get_option('libdir') / 'pkgconfig',
   )