update Cross-compiling for Amiga steps

Cross-compiling

@@ -528,11 +528,11 @@ Cross-compiler pre-built binary downloads:
 Disclaimer: This is a minimal recipe, just to help someone else get
             started if they have a desire to get a full cross-compile of
             NetHack going for the Amiga.
-            See CAVEATS below.
 
 Cross-compiler used:     bebbo's amiga-gcc
-Cross-compiler url:      https://github.com/bebbo/amiga-gcc
+Cross-compiler url:      https://github.com/AmigaPorts/m68k-amigaos-gcc
-
+Author of 3.7 support:   Ingo Paschke
+  
     To our knowledge, a pre-built copy of the cross-compiler isn't available,
     so you will likely have to obtain the cross-compiler sources via git and
     build it on your system.
@@ -542,86 +542,84 @@ Cross-compiler url:      https://github.com/bebbo/amiga-gcc
 
         sudo apt install make wget git gcc g++ lhasa libgmp-dev \
             libmpfr-dev libmpc-dev flex bison gettext texinfo ncurses-dev \
-            autoconf rsync
+            autoconf rsync libreadline-dev
 
     The build prerequisite packages for macOS via homebrew are documented but
     not tested by us any of us to date.
 
         brew install bash wget make lhasa gmp mpfr libmpc flex gettext \
-        texinfo gcc make autoconf
+            gnu-sed texinfo gcc@12 make autoconf bison
 
     After installing the prerequisite packages and the cross-compiler
-    it was a straightforward build:
+    the build is straightforward:
 
-            git clone https://github.com/bebbo/amiga-gcc.git
+    Create the /opt/amiga directory for holding the compiler and tools.
+            sudo mkdir /opt/amiga
+            sudo chgrp users /opt/amiga
+            sudo chmod 775 /opt/amiga
+            sudo usermod -a -G users username
+        (you may have to log off and back on)
+
+    Build the cross-compiler.
+            git clone https://github.com/AmigaPorts/m68k-amigaos-gcc.git amiga-gcc
             cd amiga-gcc
             make update
 
-           [Note that you may have to take ownership of the files in the bebbo
+        The compiler pieces are installed in /opt/amiga by default, and the 
-            repo via chown before successfully carrying out the next steps]
+        NetHack Makefiles expect them there.
 
-            make clean
+        If you prefer, you can alter the prefix before you build if you want.
-            make clean-prefix
+        The instructions for doing so were spelled out at the time of this writing at:
-            date; make all -j3 >&b.log; date
 
-    The compiler pieces are installed in /opt/amiga by default. If you prefer,
+            https://github.com/AmigaPorts/m68k-amigaos-gcc
-    you can alter the prefix before you build if you want. The instructions
+            Makefile adjustments will be needed, however.
-    for doing so were spelled out at the time of this writing at:
 
-        https://github.com/bebbo/amiga-gcc
+        On your linux host:
 
-    On your linux host:
+        # Clone NetHack 3.7 source
-
+        cd NetHack
-        cd sys/unix ; sh setup.sh hints/linux.370 ; cd ../..
+        sys/unix/setup.sh sys/unix/hints/linux.370
         make fetch-lua
-
+        make CROSS_TO_AMIGA=1 fetch-regex
-    On your macOS host:
-
-        cd sys/unix ; sh setup.sh hints/macOS.370 ; cd ../..
-        make fetch-lua
-
-    The Amiga cross-compile can then be carried out by specifying
-    CROSS_TO_AMIGA=1 on the make command line:
-
         make CROSS_TO_AMIGA=1 all
         make CROSS_TO_AMIGA=1 package
 
-    You can explicitly include tty and curses support if desired, otherwise
+        The distribution ZIP is created at targets/amiga/NH370AMI.ZIP.
-    you'll end up with a tty-only cross-compile build. The SDL1 pdcurses
-    support has not been tested.
 
-        make WANT_WIN_TTY=1 WANT_WIN_CURSES=1 CROSS_TO_AMIGA=1 all
+        On your macOS host, the Amiga cross-compile can be carried out by specifying
+        CROSS_TO_AMIGA=1 on the make command line:
+
+        # Clone NetHack 3.7 source
+        cd NetHack
+        sys/unix/setup.sh sys/unix/hints/macOS.370
+        make fetch-lua
+        make CROSS_TO_AMIGA=1 fetch-regex
+        make CROSS_TO_AMIGA=1 all
+        make CROSS_TO_AMIGA=1 package
 
     Result: The "make package" target will bundle the (hopefully) necessary
-            components to run NetHack on msdos into a folder:
+            components to run NetHack on an Amiga into a folder:
                 targets/amiga/pkg
             and then it zips the contents of that folder into:
-                targets/amiga/nh370ami.zip
+                targets/amiga/NH370AMI.ZIP
 
-    Also note that building the amiga targets using the make command
+    Display Modes
-    above, does not preclude you from building local linux or macOS
+    -------------
-    targets as well. Just drop the CROSS_TO_AMIGA=1 from the make
+    Two display modes are available, selected in nethack.cnf:
-    command line.
 
-    The cross-compiler hints additions are enclosed inside ifdef sections
+       Text mode (AMII):
-    and won't interfere with the non-cross-compile build in that case.
+       OPTIONS=symset:AmigaFont
 
-    CAVEATS: The original NetHack Amiga build steps included the source for
+       Tile mode (AMIV):
-             some utilities that were built and executed on the amiga:
+       OPTIONS=windowtype:amiv
-                 txt2iff and xpm2iff
-             as part of the NetHack build procedure on amiga.
-             Those did not compile out-of-the-box on the linux host. They
-             will either have to be:
-             - ported to build and run on the linux or macOS cross-compile
-               host
-          or
 
-             - their functionality will have to be rolled into amiga NetHack
+      Tile mode auto-selects tiles32.iff (32 colors, 5 bitplanes) when the
-               itself and executed on the target Amiga the first time the game
+      screen supports 32+ colors, otherwise tiles16.iff (16 colors, 4 planes).
-               is run, perhaps.
+
+    For further details about playing the game, and setting up your NetHack
+    configuration, please see the following file:
+         sys/amiga/README.amiga
 
-    If you make headway, or are successful getting a working copy of
-    NetHack going on the amiga, drop us a note at devteam@nethack.org.
 
   +--------------------------------+
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