diff --git a/doc/manual/images/callouts/1.gif b/doc/manual/images/callouts/1.gif
deleted file mode 100644
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diff --git a/doc/manual/images/callouts/10.gif b/doc/manual/images/callouts/10.gif
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diff --git a/doc/manual/images/callouts/11.gif b/doc/manual/images/callouts/11.gif
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diff --git a/doc/manual/images/callouts/12.gif b/doc/manual/images/callouts/12.gif
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diff --git a/doc/manual/images/callouts/13.gif b/doc/manual/images/callouts/13.gif
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diff --git a/doc/manual/images/callouts/14.gif b/doc/manual/images/callouts/14.gif
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diff --git a/doc/manual/images/callouts/15.gif b/doc/manual/images/callouts/15.gif
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diff --git a/doc/manual/images/callouts/2.gif b/doc/manual/images/callouts/2.gif
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diff --git a/doc/manual/images/callouts/3.gif b/doc/manual/images/callouts/3.gif
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diff --git a/doc/manual/images/callouts/4.gif b/doc/manual/images/callouts/4.gif
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diff --git a/doc/manual/images/callouts/5.gif b/doc/manual/images/callouts/5.gif
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diff --git a/doc/manual/images/callouts/6.gif b/doc/manual/images/callouts/6.gif
deleted file mode 100644
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diff --git a/doc/manual/images/callouts/7.gif b/doc/manual/images/callouts/7.gif
deleted file mode 100644
index e55ce8958..000000000
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diff --git a/doc/manual/images/callouts/8.gif b/doc/manual/images/callouts/8.gif
deleted file mode 100644
index 49375e09f..000000000
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diff --git a/doc/manual/images/callouts/9.gif b/doc/manual/images/callouts/9.gif
deleted file mode 100644
index da12a4fe2..000000000
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diff --git a/doc/manual/local.mk b/doc/manual/local.mk
index b4e7f35d5..ce05c6234 100644
--- a/doc/manual/local.mk
+++ b/doc/manual/local.mk
@@ -7,7 +7,7 @@ XSLTPROC = $(xsltproc) --nonet $(xmlflags) \
   --param xref.with.number.and.title 1 \
   --param toc.section.depth 3 \
   --param admon.style \'\' \
-  --param callout.graphics.extension \'.gif\' \
+  --param callout.graphics 0 \
   --param contrib.inline.enabled 0 \
   --stringparam generate.toc "book toc" \
   --param keep.relative.image.uris 0
@@ -69,8 +69,6 @@ $(foreach file, $(d)/manual.html, $(eval $(call install-data-in, $(file), $(docd
 
 $(foreach file, $(wildcard $(d)/figures/*.png), $(eval $(call install-data-in, $(file), $(docdir)/manual/figures)))
 
-$(foreach file, $(wildcard $(d)/images/callouts/*.gif), $(eval $(call install-data-in, $(file), $(docdir)/manual/images/callouts)))
-
 $(eval $(call install-symlink, manual.html, $(docdir)/manual/index.html))