--- sys/unix/Makefile.doc.orig	2006-12-30 05:08:31.000000000 -0800
+++ sys/unix/Makefile.doc	2014-06-28 23:55:59.000000000 -0700
@@ -53,16 +53,16 @@
 #	tbl tmac.n Guidebook.mn | groff -Wall -Tdvi > Guidebook.dvi
 
 GAME    = slashem
-MANDIR	= /usr/man/man6
+MANDIR	= ${PREFIX}/share/man/man6
 MANEXT	= 6
 FRMANDIR= $(MANDIR:man6=fr/man6)
 
 # 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 = ${BSD_INSTALL_MAN} dlb.6
 FRGAMEMANCREATE = cp fr/$(GAME).6
 # manual installation for most SYSV-style systems
 # and for man files readable in less (eg dos DJGPP+GNU)
@@ -74,12 +74,11 @@
 # FRGAMEMANCREATE = groff -Wall -mtty-char -Tutf8 -man fr/$(GAME).6 >
 
 manpages:
-	-$(GAMEMANCREATE) $(MANDIR)/$(GAME).$(MANEXT)
-	-$(LEVMANCREATE) $(MANDIR)/lev_comp.$(MANEXT)
-	-$(DGNMANCREATE) $(MANDIR)/dgn_comp.$(MANEXT)
-	-$(RCVRMANCREATE) $(MANDIR)/recover.$(MANEXT)
-	-$(DLBMANCREATE) $(MANDIR)/dlb.$(MANEXT)
-	-$(FRGAMEMANCREATE) $(FRMANDIR)/$(GAME).$(MANEXT)
+	-$(GAMEMANCREATE) ${DESTDIR}$(MANDIR)/$(GAME).$(MANEXT)
+	-$(LEVMANCREATE) ${DESTDIR}$(MANDIR)/lev_comp.$(MANEXT)
+	-$(DGNMANCREATE) ${DESTDIR}$(MANDIR)/dgn_comp.$(MANEXT)
+	-$(RCVRMANCREATE) ${DESTDIR}$(MANDIR)/recover.$(MANEXT)
+	-$(DLBMANCREATE) ${DESTDIR}$(MANDIR)/dlb.$(MANEXT)
 
 # manual creation for distribution
 DISTRIB = Guidebook.txt $(GAME).txt lev_comp.txt dgn_comp.txt recover.txt dlb.txt