Failure in make check in subversion trunk revision 13884

While doing 'make check' the following error message appeared:

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...
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PASS: Magick++/demo/demo.sh
PASS: Magick++/demo/flip.sh
angle 0
angle 30
angle 60
angle 90
angle 120
angle 150
Caught exception: lt-gravity: pixels are not authentic `#FFFFFFFFFFFF'
@ cache.c/QueueAuthenticNexus/4110
FAIL: Magick++/demo/gravity.sh
PASS: Magick++/demo/piddle.sh
PASS: Magick++/demo/shapes.sh
...
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===========================================
1 of 700 tests failed
Please report to http://www.imagemagick.org
===========================================
make[2]: *** [check-TESTS] Error 1
make[2]: Leaving directory
`/home/amartyo/magicksvn_patch_in_svn_trunk_pristine/ImageMagick'
make[1]: *** [check-am] Error 2
make[1]: Leaving directory
`/home/amartyo/magicksvn_patch_in_svn_trunk_pristine/ImageMagick'
make: *** [check] Error 2

I'm reporting it as requested. Please note that this is in a directory
containing a clean checkout from svn trunk, with no changes made by me
whatsover. I also repeated the steps with the stable tarball, i.e
6.4.8-5, and make check did not have any errors there. So the problem
appeared between the release of that tarball and revision 13884.

Regards
Amartyo