--- doc/Makefile.orig	2021-03-26 23:12:34 UTC
+++ doc/Makefile
@@ -16,7 +16,7 @@ index.html: $(INPUTS) $(HALIBUT)
 halibut.1: manpage.but
 	$(HALIBUT) --man=halibut.1 manpage.but
 
-install:
+install: halibut.1
 	mkdir -p $(man1dir)
 	$(INSTALL) -m 644 halibut.1 $(man1dir)/halibut.1