https://bugs.gentoo.org/938288
https://github.com/WayfireWM/wayfire/pull/2441

--- a/src/api/wayfire/object.hpp
+++ b/src/api/wayfire/object.hpp
@@ -4,6 +4,7 @@
 #include <typeinfo>
 #include <memory>
 #include <string>
+#include <cstdint>
 
 #include <wayfire/nonstd/observer_ptr.h>