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-rw-r--r--doc/src/sgml/Makefile3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/src/sgml/Makefile b/doc/src/sgml/Makefile
index bcfd7db0bdd..df77a142e4d 100644
--- a/doc/src/sgml/Makefile
+++ b/doc/src/sgml/Makefile
@@ -66,7 +66,8 @@ ALLSGML := $(wildcard $(srcdir)/*.sgml $(srcdir)/ref/*.sgml) $(GENERATED_SGML)
# Enable some extra warnings
# -wfully-tagged needed to throw a warning on missing tags
# for older tool chains, 2007-08-31
-override SPFLAGS += -wall -wno-unused-param -wfully-tagged
+# -wnet catches XML-style empty-element tags like <xref linkend="abc"/>.
+override SPFLAGS += -wall -wno-unused-param -wfully-tagged -wnet
# Additional warnings for XML compatibility. The conditional is meant
# to detect whether we are using OpenSP rather than the ancient
# original SP.