diff --git a/Porting b/Porting
index dc19ea75d..92bbcc57b 100644
--- a/Porting
+++ b/Porting
@@ -27,7 +27,8 @@ new machine.  The basic steps in porting the program are:
 	    If your machine uses a windowing system already supported,
 	    you need the win subdirectory for that system (or the
 	    appropriate sys subdirectory if the windowing system was
-	    previously considered restricted to one OS).
+	    previously considered restricted to one OS) and possibly
+	    win/share.
 
 	2.  Modify the appropriate include files to customize NetHack to
 	    your system.  You may need to add a new OS-specific "*conf.h"
diff --git a/sys/unix/Makefile.dat b/sys/unix/Makefile.dat
index 8b0347e37..be7b9e033 100644
--- a/sys/unix/Makefile.dat
+++ b/sys/unix/Makefile.dat
@@ -2,6 +2,9 @@
 # NetHack 3.5  Makefile.dat	$Date$  $Revision$
 #	SCCS Id: @(#)Makefile.dat	3.5	1992/09/18
 
+# Root of source tree:
+NHSROOT=..
+
 # for Atari
 # SHELL=E:/GEMINI2/MUPFEL.TTP
 # UUDECODE=uudecode
diff --git a/sys/unix/Makefile.doc b/sys/unix/Makefile.doc
index 420f81963..aa5da9445 100644
--- a/sys/unix/Makefile.doc
+++ b/sys/unix/Makefile.doc
@@ -2,6 +2,9 @@
 # NetHack 3.5  Makefile.doc	$Date$  $Revision$
 #	SCCS Id: @(#)Makefile.doc	3.5	2007/05/25
 
+# Root of source tree:
+NHSROOT=..
+
 # for Atari
 # SHELL=E:/GEMINI2/MUPFEL.TTP
 
diff --git a/sys/unix/Makefile.src b/sys/unix/Makefile.src
index fd6439309..25725e6f1 100644
--- a/sys/unix/Makefile.src
+++ b/sys/unix/Makefile.src
@@ -2,6 +2,9 @@
 # NetHack 3.5  Makefile.src	$Date$  $Revision$
 #	SCCS Id: @(#)Makefile.src	3.5	2008/01/30
 
+# Root of source tree:
+NHSROOT=..
+
 # newer makes predefine $(MAKE) to 'make' and do smarter processing of
 # recursive make calls if $(MAKE) is used
 # these makes allow $(MAKE) to be overridden by the environment if someone
diff --git a/sys/unix/Makefile.top b/sys/unix/Makefile.top
index e477e091f..fabcd0456 100644
--- a/sys/unix/Makefile.top
+++ b/sys/unix/Makefile.top
@@ -2,6 +2,9 @@
 # NetHack 3.5  Makefile.top	$Date$  $Revision$
 #	SCCS Id: @(#)Makefile.top	3.5	2007/12/12
 
+# Root of source tree:
+NHSROOT=.
+
 # newer makes predefine $(MAKE) to 'make' and do smarter processing of
 # recursive make calls if $(MAKE) is used
 # these makes allow $(MAKE) to be overridden by the environment if someone
@@ -39,6 +42,7 @@ DIRPERM  = 0755
 # instructions)
 #HACKDIR  = $(PREFIX)/games/lib/$(GAME)dir
 VARDIR  = $(HACKDIR)
+# Where nethack.sh in installed.  If this is not defined, the wrapper is not used.
 #SHELLDIR = $(PREFIX)/games
 
 # per discussion in Install.X11 and Install.Qt
@@ -90,6 +94,7 @@ $(GAME):
 	( cd src ; $(MAKE) )
 
 all:	$(GAME) recover Guidebook $(VARDAT) dungeon spec_levs check-dlb
+	true; $(MOREALL)
 	@echo "Done."
 
 # Note: many of the dependencies below are here to allow parallel make
@@ -188,19 +193,22 @@ dofiles:
 	(cd dat ; cp symbols $(HACKDIR) )
 	cp src/$(GAME) $(HACKDIR)
 	cp util/recover $(HACKDIR)
-	-rm -f $(SHELLDIR)/$(GAME)
-	sed -e 's;/usr/games/lib/nethackdir;$(HACKDIR);' \
+	-if test -n '$(SHELLDIR)'; then rm -f $(SHELLDIR)/$(GAME); fi
+	if test -n '$(SHELLDIR)'; then \
+		sed -e 's;/usr/games/lib/nethackdir;$(HACKDIR);' \
 		-e 's;HACKDIR/nethack;HACKDIR/$(GAME);' \
 		< sys/unix/nethack.sh \
-		> $(SHELLDIR)/$(GAME)
+		> $(SHELLDIR)/$(GAME) ; fi
 # set up their permissions
 	-( cd $(HACKDIR) ; $(CHOWN) $(GAMEUID) $(GAME) recover ; \
 			$(CHGRP) $(GAMEGRP) $(GAME) recover )
 	chmod $(GAMEPERM) $(HACKDIR)/$(GAME)
 	chmod $(EXEPERM) $(HACKDIR)/recover
-	-$(CHOWN) $(GAMEUID) $(SHELLDIR)/$(GAME)
-	$(CHGRP) $(GAMEGRP) $(SHELLDIR)/$(GAME)
-	chmod $(EXEPERM) $(SHELLDIR)/$(GAME)
+	-if test -n '$(SHELLDIR)'; then \
+		$(CHOWN) $(GAMEUID) $(SHELLDIR)/$(GAME); fi
+	if test -n '$(SHELLDIR)'; then \
+		$(CHGRP) $(GAMEGRP) $(SHELLDIR)/$(GAME); \
+		chmod $(EXEPERM) $(SHELLDIR)/$(GAME); fi
 	-( cd $(HACKDIR) ; $(CHOWN) $(GAMEUID) symbols ; \
 			$(CHGRP) $(GAMEGRP) symbols ; \
 			chmod $(FILEPERM) symbols )
@@ -243,8 +251,9 @@ install: rootcheck $(GAME) recover $(VARDAT) dungeon spec_levs
 	true; $(PREINSTALL)
 # set up the directories
 # not all mkdirs have -p; those that don't will create a -p directory
-	-mkdir -p $(SHELLDIR)
-	-rm -rf $(HACKDIR) $(VARDIR)
+	-if test -n '$(SHELLDIR)'; then \
+		mkdir -p $(SHELLDIR); fi
+	rm -rf $(HACKDIR) $(VARDIR)
 	-mkdir -p $(HACKDIR) $(VARDIR) $(VARDIR)/save
 	if test -d ./-p; then rmdir ./-p; fi
 	-$(CHOWN) $(GAMEUID) $(HACKDIR) $(VARDIR) $(VARDIR)/save
diff --git a/sys/unix/Makefile.utl b/sys/unix/Makefile.utl
index c933b2fcf..185d4d20b 100644
--- a/sys/unix/Makefile.utl
+++ b/sys/unix/Makefile.utl
@@ -2,6 +2,9 @@
 # NetHack 3.5  Makefile.utl	$Date$  $Revision$
 #	SCCS Id: @(#)Makefile.utl	3.5	2007/12/12
 
+# Root of source tree:
+NHSROOT=..
+
 # newer makes predefine $(MAKE) to 'make' and do smarter processing of
 # recursive make calls if $(MAKE) is used
 # these makes allow $(MAKE) to be overridden by the environment if someone
diff --git a/sys/unix/hints/macosx10.5 b/sys/unix/hints/macosx10.5
index 7b965a814..dfc5f3346 100644
--- a/sys/unix/hints/macosx10.5
+++ b/sys/unix/hints/macosx10.5
@@ -30,7 +30,7 @@ WANT_DEFAULT=tty
 ifdef WANT_WIN_QT
 QTDIR=/Developer/Qt
 LIBXPM= -L/Developer/SDKs/MacOSX10.3.9.sdk/usr/X11R6/lib -lXpm
-endif
+endif	# WANT_WIN_QT
 
 # 2. Is this a build for a binary that will be shared among different users
 #    or will it be private to you?
@@ -48,6 +48,8 @@ endif
 #WANT_SHARE_INSTALL=1
 GAMEUID  = $(USER)
 GAMEGRP  = games
+# build to run in the source tree - primarily for development.  Build with "make all"
+#WANT_SOURCE_INSTALL=1
 
 #CC=gcc -W -Wimplicit -Wreturn-type -Wunused -Wformat -Wswitch -Wshadow -Wcast-qual -Wwrite-strings -DGCC_WARN
 CC=gcc -Wall -Wextra -Wno-missing-field-initializers -Wimplicit -Wreturn-type -Wunused -Wformat -Wswitch -Wshadow -Wwrite-strings -DGCC_WARN -ansi -pedantic
@@ -66,9 +68,9 @@ WINSRC = $(WINTTYSRC)
 WINOBJ = $(WINTTYOBJ)
 WINLIB = $(WINTTYLIB)
 WINTTYLIB=-lncurses
-else
+else	# !WANT_WIN_TTY
 CFLAGS += -DNOTTYGRAPHICS
-endif
+endif	# !WANT_WIN_TTY
 
 ifdef WANT_WIN_X11
 WINSRC += $(WINX11SRC)
@@ -78,7 +80,7 @@ LFLAGS=-L/usr/X11R6/lib
 VARDATND = x11tiles NetHack.ad pet_mark.xbm
 POSTINSTALL+= bdftopcf win/X11/nh10.bdf > $(HACKDIR)/nh10.pcf; (cd $(HACKDIR); mkfontdir);
 CFLAGS += -DX11_GRAPHICS
-endif
+endif	# WANT_WIN_X11
 
 ifdef WANT_WIN_QT
 CFLAGS += -DQT_GRAPHICS -DNOUSER_SOUNDS
@@ -93,18 +95,19 @@ ifdef WANT_WIN_X11
 WINOBJ = $(sort $(WINQTOBJ) $(WINX11OBJ))
 ifdef WANT_WIN_TTY
 WINOBJ += $(WINTTYOBJ)
-endif
-else
+endif	# WANT_WIN_TTY
+else	# !WANT_WIN_X11
 WINOBJ += $(WINQTOBJ)
-endif
+endif	# !WANT_WIN_X11
+
 # XXX if /Developer/qt exists and QTDIR not set, use that
 ifndef QTDIR
 $(error QTDIR not defined in the environment or Makefile)
-endif
+endif	# QTDIR
 # XXX make sure QTDIR points to something reasonable
-else
+else	# !WANT_WIN_QT
 LINK=$(CC)
-endif
+endif	# !WANT_WIN_QT
 
 ifdef WANT_SHARE_INSTALL
 # if $GAMEUID is root, we install into roughly proper Mac locations, otherwise
@@ -117,14 +120,14 @@ CHOWN=chown
 CHGRP=chgrp
 # We run sgid so the game has access to both HACKDIR and user preferences.
 GAMEPERM = 02755
-else
+else	# ! root
 PREFIX:=/Users/$(GAMEUID)
 SHELLDIR=$(PREFIX)/bin
 HACKDIR=$(PREFIX)/nethackdir
 CHOWN=touch
 CHGRP=touch
 GAMEPERM = 0500
-endif
+endif	# ! root
 VARFILEPERM = 0664
 VARDIRPERM = 0775
 ROOTCHECK= [[ `id -u` == 0 ]] || ( echo "Must run install with sudo."; exit 1)
@@ -133,7 +136,19 @@ ROOTCHECK= [[ `id -u` == 0 ]] || ( echo "Must run install with sudo."; exit 1)
 PREINSTALL= . sys/unix/hints/macosx.sh user2 $(GAMEUID); . sys/unix/hints/macosx.sh group2 $(GAMEGRP); mkdir $(SHELLDIR); chown $(GAMEUID) $(SHELLDIR)
 POSTINSTALL+= cp -n sys/unix/sysconf $(HACKDIR)/sysconf; $(CHOWN) $(GAMEUID) $(HACKDIR)/sysconf; $(CHGRP) $(GAMEGRP) $(HACKDIR)/sysconf; chmod $(VARFILEPERM) $(HACKDIR)/sysconf;
 CFLAGS+=-DSYSCF -DSYSCF_FILE=\"$(HACKDIR)/sysconf\" -DSECURE
-else
+else ifdef WANT_SOURCE_INSTALL
+PREFIX=$(abspath $(NHSROOT))
+# suppress nethack.sh"
+#SHELLDIR=
+HACKDIR=$(PREFIX)/playground
+CHOWN=touch
+CHGRP=touch
+GAMEPERM = 0700
+VARFILEPERM = 0600
+VARDIRPERM = 0700
+# We can use "make all" to build the whole thing - but it misses some things:
+MOREALL=$(MAKE) install
+else	# !WANT_SOURCE_INSTALL
 PREFIX:=$(wildcard ~)
 SHELLDIR=$(PREFIX)/bin
 HACKDIR=$(PREFIX)/nethackdir
@@ -145,10 +160,10 @@ VARDIRPERM = 0700
 ifdef WANT_WIN_X11
 # install nethack.rc as ~/.nethackrc if no ~/.nethackrc exists
 PREINSTALL= cp -n win/X11/nethack.rc ~/.nethackrc
-endif
+endif	# WANT_WIN_X11
 POSTINSTALL+= cp -n sys/unix/sysconf $(HACKDIR)/sysconf; $(CHOWN) $(GAMEUID) $(HACKDIR)/sysconf; $(CHGRP) $(GAMEGRP) $(HACKDIR)/sysconf; chmod $(VARFILEPERM) $(HACKDIR)/sysconf;
 CFLAGS+=-DSYSCF -DSYSCF_FILE=\"$(HACKDIR)/sysconf\" -DSECURE
-endif
+endif	# !WANT_SOURCE_INSTALL
 
 
 # ~/Library/Preferences/NetHack Defaults