Now it fails with ... any idea?

gcc -O3 -Wall -c vt1165.c
In file included from vt1165.h:17:0,
                 from vt1165.c:18:
types.h:19:17: error: redefinition of typedef ‘u8’
types.h:19:17: note: previous declaration of ‘u8’ was here
types.h:20:18: error: redefinition of typedef ‘u16’
types.h:20:18: note: previous declaration of ‘u16’ was here
types.h:21:18: error: redefinition of typedef ‘u32’
types.h:21:18: note: previous declaration of ‘u32’ was here