Install SDL_hidapi.h
diff --git a/Makefile.in b/Makefile.in
index 65ccc55..f72ef2f 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -80,6 +80,7 @@ HDRS = \
SDL_gamecontroller.h \
SDL_gesture.h \
SDL_haptic.h \
+ SDL_hidapi.h \
SDL_hints.h \
SDL_joystick.h \
SDL_keyboard.h \