[Magick-bugs] convert -version

[duc.sequere.aut.de.via.decede at imagemagick.org]

> In the ubuntu 6.4.5 version however the return code is 1

That's a bug which was fixed some time ago.  From the ChangeLog:

2009-03-01  6.4.9-9 Cristy  <quetzlzacatenango at image...>
  * Convert returns MagickFalse for the -version option (reference
    http://www.imagemagick.org/discourse-server/viewtopic.php?f=2&t=13230).

> Maybe there is a better way to determine whether ImageMagick is installed?

You're using autoconf right?  If so you can use AC_PATH_PROG() to determine
if convert is installed on the system.