--- sys/autoconf/Makefile.doc.orig	2010-01-10 23:51:59.000000000 +0900
+++ sys/autoconf/Makefile.doc	2010-01-19 14:56:00.437356006 +0900
@@ -49,15 +49,15 @@
 #	tbl tmac.n Guidebook.mn | groff -Wall -Tdvi > Guidebook.dvi
 
 GAME    = unnethack
-MANDIR	= /usr/man/man6
+MANDIR	= $(MANPREFIX)/man/man6
 MANEXT	= 6
 
 # manual installation for most BSD-style systems
-GAMEMANCREATE = cp $(GAME).6
-LEVMANCREATE = cp lev_comp.6
-DGNMANCREATE = cp dgn_comp.6
-RCVRMANCREATE = cp recover.6
-DLBMANCREATE = cp dlb.6
+GAMEMANCREATE = $(BSD_INSTALL_MAN) $(GAME).6
+LEVMANCREATE = $(BSD_INSTALL_MAN) lev_comp.6
+DGNMANCREATE = $(BSD_INSTALL_MAN) dgn_comp.6
+RCVRMANCREATE = $(BSD_INSTALL_MAN) recover.6
+DLBMANCREATE = $(BSD_INSTALL_MAN) dlb.6
 # manual installation for most SYSV-style systems
 # and for man files readable in less (eg dos DJGPP+GNU)
 # GAMEMANCREATE = groff -Wall -mtty-char -Tascii -man $(GAME).6 >