I get the following warning when downloading programs using version 1.6.26.
avrdude: WARNING: invalid value for unused bits in fuse "fuse5", should be set to 1 according to datasheet
This behaviour is deprecated and will result in an error in future version
You probably want to use 0xcd instead of 0xc9 (double check with your datasheet first).
My code seems to run fine.
That warning is normal and expected. You can safely ignore it.