diff --git a/sys/unix/hints/linux.2020 b/sys/unix/hints/linux.2020
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+#
+# NetHack 3.7  linux.2020 $NHDT-Date: 1596498415 2020/08/03 23:46:55 $  $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.32 $
+# Copyright (c) Kenneth Lorber, Kensington, Maryland, 2007.
+# NetHack may be freely redistributed.  See license for details. 
+#
+#-PRE
+# Linux hints file with support for multiple window ports (interfaces)
+#
+# This hints file supports tty, curses, x11, and Qt in the same binary,
+# but:
+#
+#  - For x11 support, you'll need to obtain and install x11 development libraries.
+#    For example, on Ubuntu 20.04 (as of August 2020):
+#        sudo apt-get install libx11-dev
+#        sudo apt-get install libmotif-dev
+#        sudo apt-get install libxaw7-dev
+#	 sudo apt install xfonts-utils
+#       (That last one is for bdftopcf and mkfontdir utils)
+#
+#  - For Qt support, you'll need to obtain and install Qt.
+#    For example, on Ubuntu 20.04 (as of August 2020):
+#        sudo apt-get install qtbase5-dev
+#        sudo apt-get install qtmultimedia5-dev
+#
+#    Another odd note about Qt on Linux is that if you find you are getting
+#    the following error trying to run NetHack after you build it:
+#         "error while loading shared libraries: libQt5Core.so.5:
+#          cannot open shared object file: No such file or directory"
+#    you may have to fix that (one-time only) by the following command:
+#     sudo strip --remove-section=.note.ABI-tag /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
+#
+#  - For curses support, you may need to obtain and install the
+#    ncurses development libraries if they aren't already installed
+#    with your distribution. They seem to be there already with Ubuntu 20.04, but
+#    for example, if you needed to install ncurses:
+#        sudo apt-get install libncurses-dev
+#
+#  - tty support shouldn't require any prerequisite additional packages.
+#
+# Assuming you have the prerequisite packages mentioned above, you can
+# specify, right on the make command line, which window ports (or interfaces)
+# to include in your build. Doing it via the make command line means that won't
+# have to edit the Makefile.
+#
+# make WANT_WIN_QT=1 WANT_WIN_X11=1 WANT_WIN_CURSES=1 WANT_WIN_TTY=1 install
+#
+# Add WANT_DEFAULT=Qt (or other interface) if you want nethack to use
+# something other than tty as the default interface.
+#
+# 1. Which windowing interface(s) should be included in this binary?
+# One or more of these can be manually uncommented and/or can be specified
+# on the 'make' command line.  If none are enabled, tty will be used.
+#WANT_WIN_TTY=1
+#WANT_WIN_CURSES=1
+#WANT_WIN_X11=1
+#WANT_WIN_QT=1
+
+# 1a. What is the default window system?
+# Exactly one of these can be manually uncommented and/or can be specified
+# on the 'make' command line.  If none is enabled, the first among
+# WANT_WIN_{tty,curses,X11,Qt} that is enabled will become default.
+#WANT_DEFAULT=tty
+#WANT_DEFAULT=curses
+#WANT_DEFAULT=Qt
+#WANT_DEFAULT=X11
+
+ifdef WANT_WIN_QT
+QTDIR=/usr
+endif	# WANT_WIN_QT
+ifndef LIBXPM
+LIBXPM= -L/opt/X11/lib -lXpm
+endif
+
+# 2. Not customizable in this linux.2020 hints file, which provides
+#    a single-user build for Linux (such as Ubuntu focal).
+GAMEUID  = $(USER)
+GAMEGRP  = games
+
+# 3. miscellaneous:  compiler selection; Qt5 requires C++11
+ifdef WANT_WIN_QT
+CC=clang
+CXX=clang++ -std=gnu++11
+#CC=gcc
+#CXX=g++ -std=gnu++11
+LINK= $(CXX)
+else
+# compiling C code only; CC and CXX defaults can be used
+#CC=
+#CXX=
+LINK = $(CC)
+endif
+#MOC = moc
+
+#
+# You shouldn't need to change anything below here (in the hints file; if
+# you're reading this in Makefile augmented by hints, that may not be true).
+#
+
+# Make sure that at least one interface is enabled.
+ifndef WANT_WIN_TTY
+ifndef  WANT_WIN_CURSES
+ifndef   WANT_WIN_X11
+ifndef    WANT_WIN_QT
+WANT_WIN_TTY=1
+endif
+endif
+endif
+endif
+
+# Make sure that a default interface is specified; this doesn't guarantee
+# sanity for something like 'make WANT_WIN_CURSES=1 WANT_DEFAULT=X11' but
+# 'makedefs -v' would notice, complain, and quit causing 'make' to quit.
+ifndef WANT_DEFAULT
+# pick the first one enabled among { tty, curses, X11, Qt }
+ifdef WANT_WIN_TTY
+WANT_DEFAULT=tty
+else
+ifdef  WANT_WIN_CURSES
+WANT_DEFAULT=curses
+else
+ifdef   WANT_WIN_X11
+WANT_DEFAULT=X11
+else
+ifdef    WANT_WIN_QT
+WANT_DEFAULT=Qt
+else
+# ? shouldn't be able to get here...
+endif
+endif
+endif
+endif
+endif
+
+CFLAGS=-g -O -I../include -DNOTPARMDECL
+CFLAGS+=-DDLB
+CFLAGS+=-DCOMPRESS=\"/bin/gzip\" -DCOMPRESS_EXTENSION=\".gz\"
+CFLAGS+=-DSYSCF -DSYSCF_FILE=\"$(HACKDIR)/sysconf\" -DSECURE
+CFLAGS+=-DTIMED_DELAY
+CFLAGS+=-DHACKDIR=\"$(HACKDIR)\"
+CFLAGS+=-DDUMPLOG
+CFLAGS+=-DCONFIG_ERROR_SECURE=FALSE
+#CFLAGS+=-DEXTRA_SANITY_CHECKS
+#CFLAGS+=-DEDIT_GETLIN
+#CFLAGS+=-DSCORE_ON_BOTL
+#CFLAGS+=-DMSGHANDLER
+#CFLAGS+=-DTTY_TILES_ESCCODES
+#CFLAGS+=-DTTY_SOUND_ESCCODES
+
+WINSRC =
+WINOBJ0 =
+WINLIB =
+VARDATND =
+VARDATND0 =
+CURSESLIB =
+
+ifdef WANT_WIN_TTY
+WINSRC += $(WINTTYSRC)
+WINOBJ0 += $(WINTTYOBJ)
+CURSESLIB = -lncurses -ltinfo
+else	# !WANT_WIN_TTY
+CFLAGS += -DNOTTYGRAPHICS
+endif	# !WANT_WIN_TTY
+
+ifdef WANT_WIN_CURSES
+CFLAGS += -DCURSES_GRAPHICS
+WINSRC += $(WINCURSESSRC)
+WINOBJ0 += $(WINCURSESOBJ)
+CURSESLIB = -lncurses -ltinfo
+endif
+
+ifdef CURSESLIB
+WINLIB += $(CURSESLIB)
+endif
+
+ifdef WANT_WIN_X11
+CFLAGS += -DX11_GRAPHICS
+USE_XPM=1
+WINX11LIB = -lXaw -lXmu -lXext -lXt -lX11
+VARDATND0 += x11tiles NetHack.ad pet_mark.xbm pilemark.xbm
+# -x: if built without dlb, some versions of mkfontdir think *.lev are fonts
+POSTINSTALL += bdftopcf win/X11/nh10.bdf > $(HACKDIR)/nh10.pcf; ( cd $(HACKDIR); mkfontdir -x .lev );
+# separate from CFLAGS so that we don't pass it to every file
+X11CFLAGS = -I/opt/X11/include
+# avoid repeated complaints about _X_NONNULL(args...) in <X11/Xfuncproto.h>
+X11CFLAGS += -Wno-variadic-macros
+ifdef USE_XPM
+CFLAGS += -DUSE_XPM
+WINX11LIB += -lXpm
+VARDATND0 += rip.xpm
+endif
+WINSRC += $(WINX11SRC)
+WINOBJ0 += $(WINX11OBJ)
+WINLIB += $(WINX11LIB)
+LFLAGS=-L/opt/X11/lib
+endif	# WANT_WIN_X11
+
+ifdef WANT_WIN_QT
+CFLAGS += -DQT_GRAPHICS
+QTCXXFLAGS += -Wno-deprecated-declarations
+QTCXXFLAGS += $(shell PKG_CONFIG_PATH=$(QTDIR)/lib/pkgconfig pkg-config Qt5Gui Qt5Widgets Qt5Multimedia --cflags)
+QTCXXFLAGS += -fPIC
+WINLIB += $(shell PKG_CONFIG_PATH=$(QTDIR)/lib/pkgconfig pkg-config Qt5Gui Qt5Widgets Qt5Multimedia --libs)
+WINSRC += $(WINQTSRC)
+WINOBJ0 += $(WINQTOBJ)
+VARDATND0 += nhtiles.bmp rip.xpm nhsplash.xpm pet_mark.xbm pilemark.xbm
+# XXX if /Developer/qt exists and QTDIR not set, use that
+ifndef QTDIR
+$(error QTDIR not defined in the environment or Makefile)
+endif	# QTDIR
+# XXX make sure QTDIR points to something reasonable
+POSTINSTALL+= cp -n sys/unix/sysconf $(INSTDIR)/sysconf; \
+		$(CHOWN) $(GAMEUID) $(INSTDIR)/sysconf; \
+		$(CHGRP) $(GAMEGRP) $(INSTDIR)/sysconf; \
+		chmod $(VARFILEPERM) $(INSTDIR)/sysconf;
+POSTINSTALL+= bdftopcf win/X11/nh10.bdf > $(INSTDIR)/nh10.pcf; \
+		( cd $(INSTDIR); mkfontdir -x .lev );
+endif	# !WANT_WIN_QT
+
+# prevent duplicate tile.o in WINOBJ
+WINOBJ = $(sort $(WINOBJ0))
+# prevent duplicates in VARDATND if both X11 and Qt are being supported
+VARDATND += $(sort $(VARDATND0))
+
+#PREFIX=/usr
+PREFIX=$(wildcard ~)/nh/install
+HACKDIR=$(PREFIX)/games/lib/$(GAME)dir
+SHELLDIR = $(PREFIX)/games
+INSTDIR=$(HACKDIR)
+VARDIR = $(HACKDIR)
+
+POSTINSTALL+= cp -n sys/unix/sysconf $(INSTDIR)/sysconf; \
+	$(CHOWN) $(GAMEUID) $(INSTDIR)/sysconf; \
+	$(CHGRP) $(GAMEGRP) $(INSTDIR)/sysconf; \
+	chmod $(VARFILEPERM) $(INSTDIR)/sysconf;
+# gdb may not be installed if clang is chosen compiler so the game 
+# won't start in that case due to a sysconf error. Comment out
+# relevant lines in sysconf.
+POSTINSTALL+= sed -i -e 's;^GDBPATH=/usr/bin/gdb;\#GDBPATH=/usr/bin/gdb;' \
+		-e 's;PANICTRACE_GDB=1;PANICTRACE_GDB=0;' $(INSTDIR)/sysconf;
+
+# when building liblua.a, avoid warning that use of tmpnam() should be
+# replaced by mkstemp(); the lua code doesn't use nethack's config.h so
+# this needs to be passed via make rather than defined in unixconf.h
+SYSCFLAGS=-DLUA_USE_POSIX
+
+# Only needed for GLIBC stack trace:
+LFLAGS=-rdynamic
+
+# if TTY_TILES_ESCCODES
+#WINSRC += tile.c
+#WINOBJ += tile.o
+
+CHOWN=true
+CHGRP=true
+
+VARDIRPERM = 0755
+VARFILEPERM = 0600
+GAMEPERM = 0755