--- a/Makefile
+++ b/Makefile
@@ -64,6 +64,12 @@
 DATA_built = $(EXTSQL)
 DATA = $(EXTMISC)
 EXTRA_CLEAN += sql/plproxy.sql
+install: install-vpath-fix
+install-vpath-fix:
+	mkdir -p doc
+	ln -sf $(VPATH)/doc/Makefile doc
+	cp $(VPATH)/plproxy.control .
+	cp $(VPATH)/sql/*.sql sql
 else
 DATA_built = sql/plproxy.sql
 EXTRA_CLEAN += $(EXTSQL)
