--- postgresql-13.1/src/bin/pgevent/Makefile.orig	2021-07-18 16:38:12.660763100 -0700
+++ postgresql-13.1/src/bin/pgevent/Makefile	2021-07-18 16:38:41.035766900 -0700
@@ -29,6 +29,9 @@
 
 include $(top_srcdir)/src/Makefile.shlib
 
+libpgeventdll.def: pgevent.def
+	cp -f $< $@
+
 pgmsgevent.o: pgmsgevent.rc win32ver.rc
 	$(WINDRES) $< -o $@ --include-dir=$(top_builddir)/src/include --include-dir=$(top_srcdir)/src/include --include-dir=$(srcdir) --include-dir=.