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-rw-r--r--doc/hackersguide/Makefile.am1
1 files changed, 1 insertions, 0 deletions
diff --git a/doc/hackersguide/Makefile.am b/doc/hackersguide/Makefile.am
index 37269eaf0..e7e9289c4 100644
--- a/doc/hackersguide/Makefile.am
+++ b/doc/hackersguide/Makefile.am
@@ -52,6 +52,7 @@ hackersguide.html: $(hackersguide_docbook)
touch $^; \
fi
endif
+ $(SED) -i -e '/<img [^>]*alt=/! s/<img /<img alt="" /g' $@ # we want valid XHTML 1.1
if HAVE_RSVG
.svg.png: