Magick.c: In function `XS_Image__Magick_Animate':
Magick.c:1978: warning: unused variable `ref'
Magick.c:1973: warning: unused variable `ix'
Magick.c: In function `XS_Image__Magick_Append':
Magick.c:2052: warning: unused variable `ref'
Magick.c:2047: warning: unused variable `ix'
Magick.c: In function `XS_Image__Magick_Average':
Magick.c:2183: warning: unused variable `ref'
Magick.c:2178: warning: unused variable `ix'