I just checked out trunk, and
$ convert --version
which worked as of 6.7.7
now says
Error: Invalid argument or not enough arguments
Usage: convert [ {option} | {image} ... ] {output_image}
convert -help | -version | -usage | -list {option}
Please continue to accept double dashes on long option names.
Double dashs no longer accepted in long option names?!
Re: Double dashs no longer accepted in long option names?!
You're running ImageMagick 7.0.0-0 Alpha. Grab the stable release, ImageMagick 6.8.6-8. The --version option works for the stable release. However, we added a patch to fix --version for ImageMagick 7 in the Subversion trunk. Thanks.