--- unix/Makefile.orig	Wed Nov 19 18:47:29 1997
+++ unix/Makefile	Wed Nov 19 18:47:43 1997
@@ -560,7 +560,7 @@
 bsd:		_bsd	# generic BSD (BSD 4.2 & Ultrix handled in unzip.h)
 
 _bsd:		unix_make
-	$(MAKE) unzips CF="$(CF) -DBSD"
+	$(MAKE) unzips CF="$(CF) -DBSD -DUNIX"
 
 #----------------------------------------------------------------------------
 #  SysV group (for extern long timezone and ioctl.h instead of sgtty.h):