$NetBSD$

Was failing without this with GNUmakefile:928: start] Error 1

--- GNUmakefile.orig	2020-03-17 03:19:02.000000000 +0000
+++ GNUmakefile
@@ -924,8 +924,7 @@ endif
 
 all: duke3d
 
-start:
-	$(BUILD_STARTED)
+start: duke3d
 
 tools: $(addsuffix $(EXESUFFIX),$(tools_targets)) | start
 	@$(call LL,$^)
