bug#7955: configure does not thoroughly test for ImageMagick includes

[Chong Yidong]

Joakim, mind taking a look at this?  Thanks.


Glenn Morris <rgm@gnu.org> writes:

> Package: emacs
> Version: 24.0.50
> Severity: minor
>
> I tried to build the current trunk on a RHEL 4.8 system.
> This has ImageMagick 6.0.7 installed.
> configure decided that ImageMagick was usable:
>
>   checking for Wand... yes
>   checking IMAGEMAGICK_CFLAGS...
>   checking IMAGEMAGICK_LIBS... -lWand -lMagick
>   checking for MagickExportImagePixels... no
>   [...]
>   Does Emacs use imagemagick?                             yes
>
> However, the build failed because of this:
>
>   image.c:7455:29: warning: wand/MagickWand.h: No such file or directory
>
> The system has /usr/include/wand/magick_wand.h, but it does not
> have /usr/include/wand/MagickWand.h. Looks like the former is now
> deprecated. The latter does exist on RHEL 5.5, with ImageMagick 6.2.8.
>
> Obviously I can just re-configure using --without-imagemagick, but
> Emacs should do this for me. Either configure should test for some
> required minimum version of ImageMagick (I was not able to find out in
> what version wand/MagickWand.h was added); or image.c should fall back
> to wand/magick_wand.h if it can.