+# Use the man page converter that is available. We should never depend
+# on MAN_ROFF_FILES if a converter is not available.
+${MAN_ROFF_FILES}: ${MAN_RST_FILES}
+ifeq ($(HAVE_SPHINX),1)
+ $(SPHINXBUILD) -b man $(ALLSPHINXOPTS) $(DOCBUILDDIR)/man
+ for section in 1 5 7; do \
+ mkdir -p $(DOCBUILDDIR)/man/man$${section}; \
+ mv $(DOCBUILDDIR)/man/*.$${section} $(DOCBUILDDIR)/man/man$${section}; \
+ done
+else ifeq ($(HAVE_RST2MAN),1)
+ $(prerst2man) $(srcdir)/doc $(DOCBUILDDIR)/man
+else
+ @echo "Fatal: build dependency fail."
+ @false
+endif
+
+# Do not try to build or install man pages if a man page converter is
+# not available.
+ifeq ($(HAVE_SPHINX)$(HAVE_RST2MAN),00)
+build-man:
+install-man:
+ @echo "No sphinx or rst2man, will not install man pages."
+else
+build-man: ${MAN_GZIP_FILES}