Marco,

A recent discussion on Fedora's devel list has brought to my attention
that ImageMagick 7 would be incompatible with 6 not only wrt API/ABI but
also wrt CLI (affecting scripts etc.).  It would seem prudent to stick
with the 6 series for the time being until the Linux distributions sort
this out.

If you concur, would you mind updating ImageMagick to the latest 6.9
release?  It seems to be somewhat behind at the moment.

-- 
Yaakov