--- heirloom-sh/makefile.orig	2010-12-16 02:22:05.400000007 -0430
+++ heirloom-sh/makefile	2010-12-16 02:24:37.463333339 -0430
@@ -1,3 +1,5 @@
+PREFIX=/usr/heirloom
+
 #
 # Root directory. Mainly useful for package building; leave empty for
 # normal installation.
@@ -7,12 +9,12 @@
 #
 # The destination directory for the "sh" and "jsh" binaries.
 #
-SV3BIN=/usr/5bin
+SV3BIN=$(PREFIX)/bin
 
 #
 # Location for manual pages (with man1 below).
 #
-MANDIR=/usr/share/man/5man
+MANDIR=$(PREFIX)/share/man
 
 #
 # Enable this definition if spell checking should be done for the
@@ -23,7 +25,7 @@
 #
 # A BSD-compatible install command.
 #
-UCBINST=/usr/ucb/install
+UCBINST=install
 
 #
 # The strip command that is used at installation time.