update test skip conditions and notice

Turns out giflib 5.1.2 is the culprit and it isn't Deban-specific after all.

1 files changed, 5 insertions, 3 deletions

diff --git a/man/feh.pre b/man/feh.pre
index 50f5961..3941655 100644
--- a/man/feh.pre
+++ b/man/feh.pre
@@ -1701,16 +1701,18 @@ section.
 .
 .Pp
 .
-On some systems with Imlib2 1.4.7,
+On systems with Imlib2 >= 1.4.7 and giflib >= 5.1.2,
 .Nm
 may be unable to load gif images. For affected mips, mipsel and arm devices,
 gif support is completely broken, while on x86 / x86_64 gifs can usually
 only be loaded if they are the first image in the filelist.
-This appears to be caused by a Debian and/or Imlib2 bug. See
+This appears to be an Imlib2 and/or giflib bug introduced in giflib 5.1.2.
+See
 .Aq https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=813729
 for details. Workaround: Use
 .Cm --magick-timeout 5
-.Pq or some other positive value .
+.Pq or some other positive value
+to load gifs with imagemagick instead, or downgrade giflib to 5.1.1.
 .
 .Pp
 .