diff -ru heirloom-070715.orig/build/mk.config heirloom-070715/build/mk.config
--- heirloom-070715.orig/build/mk.config	2007-07-15 09:36:59.000000000 -0400
+++ heirloom-070715/build/mk.config	2010-12-16 18:37:43.923333340 -0430
@@ -1,3 +1,5 @@
+PREFIX = /usr/heirloom
+
 #
 # This is the shell used for the compilation phase, the execution of most
 # installed scripts, and the shell escapes in the traditional command
@@ -6,7 +8,7 @@
 # Bourne shell is recommended. It then must obviously be compiled and
 # installed first.
 #
-SHELL = /sbin/sh
+SHELL = $(DEFBIN)/sh
 
 #
 # Specify the path name for a POSIX-conforming shell here. For example,
@@ -25,33 +27,33 @@
 # Location for binaries that have no special personality. This location
 # may be identical to that of one of the first three personalities below.
 #
-DEFBIN = /usr/5bin
+DEFBIN = $(PREFIX)/bin
 
 #
 # Location for SVID3/SVR4-style binaries.
 #
-SV3BIN = /usr/5bin
+SV3BIN = $(DEFBIN)
 
 #
 # Location for SVID4/SVR4.2-style binaries.
 #
-S42BIN = /usr/5bin/s42
+S42BIN = $(DEFBIN)/s42
 
 #
 # Location for POSIX.2/SUS-style binaries.
 #
-SUSBIN = /usr/5bin/posix
+SUSBIN = $(DEFBIN)/posix
 
 #
 # Location for POSIX.1-2001/SUSv3-style binaries.
-SU3BIN = /usr/5bin/posix2001
+SU3BIN = $(DEFBIN)/posix2001
 
 #
 # Location for SVR4 UCB-style binaries. These do not form a complete
 # personality, and the binary path must not be identical to the default
 # one.
 #
-UCBBIN = /usr/ucb
+UCBBIN = $(DEFBIN)/ucb
 
 #
 # Location for development binaries. The "tsort" utility is
@@ -59,23 +61,28 @@
 # "Heirloom Development Tools" package are expected to be
 # installed in it.
 #
-CCSBIN = /usr/ccs/bin
+CCSBIN = $(DEFBIN)
+
+#
+# Shell for man scripts.
+#
+MANSH = /bin/bash
 
 #
 # Location for library files.
 #
-DEFLIB = /usr/5lib
+DEFLIB = $(PREFIX)/lib
 
 #
 # Location for superuser-only binaries. May be identical to the
 # default binary directory.
 #
-DEFSBIN = /usr/5bin
+DEFSBIN = $(DEFBIN)
 
 #
 # Location for manual pages (with man1, man1b ... man8 below).
 #
-MANDIR = /usr/share/man/5man
+MANDIR = $(PREFIX)/share/man
 
 #
 # Location for default files. Make sure that this directory is accessible
@@ -87,7 +94,7 @@
 # Location for the spell history file (contains misspelled words for
 # all users; set to /dev/null to disable).
 #
-SPELLHIST = /var/adm/spellhist
+SPELLHIST = /var/cache/spellhist
 
 #
 # Location for the su logfile.
@@ -108,7 +115,7 @@
 #
 # On HP-UX, AIX, FreeBSD, NetBSD, and OpenBSD, this setting is not used.
 #
-TTYGRP = -g utmp
+#TTYGRP = -g utmp
 
 #
 # Curses library. Change to -lncurses if necessary. Caution: Some gcc