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-rw-r--r--doc/local.mk4
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/local.mk b/doc/local.mk
index 51800bb35b..ed87638a56 100644
--- a/doc/local.mk
+++ b/doc/local.mk
@@ -122,6 +122,10 @@ dist_infoimage_DATA = \
%D%/images/installer-partitions.png \
%D%/images/installer-resume.png
+# Ask for warnings about cross-referenced manuals that are not listed in
+# htmlxref.cnf.
+AM_MAKEINFOHTMLFLAGS = --set-customization-variable CHECK_HTMLXREF=true
+
# Try hard to obtain an image size and aspect that's reasonable for inclusion
# in an Info or PDF document.
DOT_OPTIONS = \