add missing <sys/types.h> include ok stsp
diff --git a/lib/utf8.c b/lib/utf8.c
index 41c3f2e..167f4f5 100644
--- a/lib/utf8.c
+++ b/lib/utf8.c
@@ -15,6 +15,8 @@
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
+#include <sys/types.h>
+
#include <err.h>
#include <stdlib.h>
#include <string.h>