https://gitlab.gnome.org/GNOME/gthumb/-/issues/222

diff --git a/meson.build b/meson.build
index 2a970673..4cdc1a5e 100644
--- a/meson.build
+++ b/meson.build
@@ -232,6 +232,7 @@ common_deps = [
   dependency('gmodule-2.0'),
   dependency('gio-unix-2.0'),
   dependency('gtk+-3.0', version : gtk_version),
+  dependency('x11'),
   dependency('libpng'),
   dependency('zlib'),
   dependency('gsettings-desktop-schemas')