$NetBSD$

Substitute apparent linux usage of "fmt" with "tr".

--- Makefile.orig	2021-01-20 02:08:37.000000000 +0000
+++ Makefile
@@ -179,7 +179,7 @@ extra_clean := $(extra_clean) *~ */*~
 	@$(CC) -MM $(CPPFLAGS) -o $*.d $<
 	@mv -f $*.d $*.d.tmp
 	@sed -e 's|.*:|$*.o $*.d:|' < $*.d.tmp > $*.d
-	@sed -e 's/.*://' -e 's/\\$$//' < $*.d.tmp | fmt -1 | sed -e 's/^ *//' -e 's/$$/:/' >> $*.d
+	@sed -e 's/.*://' -e 's/\\$$//' < $*.d.tmp | tr " " "\n" | sed -e 's/^ *//' -e 's/$$/:/' >> $*.d
 	@rm -f $*.d.tmp
 	@echo Building $@
 	@$(CC) $(CPPFLAGS) $(CFLAGS) -o $@ -c $<