Downgrade standard version of ImageMagick to a non-changing URL.

- bleeding edge still available but commented by default.

var/spack/packages/ImageMagick/package.py

@@ -3,18 +3,32 @@
 class Imagemagick(Package):
     """ImageMagick is a image processing library"""
     homepage = "http://www.imagemagic.org"
-    url      = "http://www.imagemagick.org/download/ImageMagick-6.8.9-10.tar.gz"
 
-    version('6.9.0-0',  '2cf094cb86ec518fa5bc669ce2d21613')
-    version('6.8.9-10', 'aa050bf9785e571c956c111377bbf57c')
-    version('6.8.9-9',  'e63fed3e3550851328352c708f800676')
+    #-------------------------------------------------------------------------
+    # ImageMagick does not keep around anything but *-10 versions, so
+    # this URL may change.  If you want the bleeding edge, you can
+    # uncomment it and see if it works but you may need to try to
+    # fetch a newer version (-6, -7, -8, -9, etc.) or you can stick
+    # wtih the older, stable, archived -10 versions below.
+    #
+    # TODO: would be nice if spack had a way to recommend avoiding a
+    # TODO: bleeding edge version, but not comment it out.
+    # -------------------------------------------------------------------------
+    # version('6.9.0-6', 'c1bce7396c22995b8bdb56b7797b4a1b',
+    # url="http://www.imagemagick.org/download/ImageMagick-6.9.0-6.tar.bz2")
+
+    #-------------------------------------------------------------------------
+    # *-10 versions are archived, so these versions should fetch reliably.
+    # -------------------------------------------------------------------------
+    version('6.8.9-10', 'aa050bf9785e571c956c111377bbf57c',
+            url="http://sourceforge.net/projects/imagemagick/files/old-sources/6.x/6.8/ImageMagick-6.8.9-10.tar.gz/download")
 
     depends_on('libtool')
     depends_on('jpeg')
     depends_on('libpng')
     depends_on('freetype')
     depends_on('fontconfig')
-#   depends_on('libtiff')
+    depends_on('libtiff')
 
     def install(self, spec, prefix):
         configure("--prefix=%s" % prefix)