Need to pull more tricks to make out-of-three build work

src/Makefile.am

@@ -403,13 +403,26 @@ VSC_RST = \
 
 BUILT_SOURCES = counters.rst
 
+.PHONY: link_srcdir
+link_srcdir: $(BUILT_SOURCES)
+	if test "x$(srcdir)" != "x$(builddir)" ; then \
+		s=`cd $(srcdir) && pwd`; \
+		for f in `cd $$s && find . -type f -name \*.rst`; do \
+			d=`dirname $$f`; \
+			test -d $$d || mkdir -p $$d; \
+			test -f $$f || ln -s $$s/$$f $$f; \
+		done \
+	fi
+
 CLEANFILES += $(VSC_SOURCES) $(VSC_RST) $(BUILT_SOURCES)
 
 counters.rst: $(VSC_RST)
 	$(AM_V_GEN) cat $(VSC_RST) >${@}_
 	@mv ${@}_ $@
 
-slash-counters.7: counters.rst
+slash-counters.rst: link_srcdir
+
+slash-counters.7: counters.rst slash-counters.rst
 
 nodist_libvmod_slash_la_SOURCES += $(VSC_SOURCES)