+#include <sys/types.h>
+
+#ifndef __cplusplus
+#if !defined(_MSC_VER)
+#include <stdbool.h>
+typedef bool lto_bool_t;
+#else
+/* MSVC in particular does not have anything like _Bool or bool in C, but we can
+ at least make sure the type is the same size. The implementation side will
+ use C++ bool. */
+typedef unsigned char lto_bool_t;
+#endif
+#else
+typedef bool lto_bool_t;
+#endif