--- makefile.orig	1991-07-17 01:52:08.000000000 +1000
+++ makefile	2012-05-14 16:35:24.000000000 +1000
@@ -235,7 +235,7 @@
 parse.o: zoofns.h zooio.h
 portable.o: /usr/include/stdio.h assert.h debug.h machine.h options.h
 portable.o: portable.h various.h zoo.h zoofns.h zooio.h
-prterror.o: /usr/include/stdio.h /usr/include/varargs.h options.h various.h
+prterror.o: /usr/include/stdio.h options.h various.h
 prterror.o: zoofns.h zooio.h
 sysv.o: /usr/include/sys/stat.h /usr/include/sys/types.h /usr/include/time.h
 sysv.o: nixmode.i nixtime.i