Without the change `hfst-ospell` fails build on `staging-next` as:
hfst-ol.h:39:9: error: 'uint16_t' does not name a type
39 | typedef uint16_t SymbolNumber;
| ^~~~~~~~
hfst-ol.h:35:1: note: 'uint16_t' is defined in header '<cstdint>'; did you forget to '#include <cstdint>'?
34 | #include <utility>
+++ |+#include <cstdint>
35 | #include "ol-exceptions.h"
hfst-ol.h:40:9: error: 'uint32_t' does not name a type
40 | typedef uint32_t TransitionTableIndex;
| ^~~~~~~~
