--- gforth/INSTALL	1995/02/09 17:49:49	1.6
+++ gforth/INSTALL	1995/10/11 19:39:31	1.10
@@ -1,33 +1,97 @@
-Preliminary version
-
 You need gcc version 2.0 or later to compile gforth.
+
 First, type
 
-configure
+./configure
 
 configure has the following useful parameters:
--direct-threaded: setup for a direct threaded interpreter; this is faster
-   on many machines, but needs special support. Unsupported machines will
-   ingore this switch. On some CISC machines, direct threading isn't an
-   advantage over indirect threading.
-
--without-debug: omits the -g switch and creates smaller images on machines
-   where "strip" has problems with gcc style debugging informations.
+  --prefix=PREFIX         install architecture-independent files in PREFIX
+                          [default: /usr/local]
+  --exec-prefix=PREFIX    install architecture-dependent files in PREFIX
+                          [default: same as prefix]
+  --enable-force-reg      Use explicit register declarations if they appear in
+                          the machine.h file. This can cause a good speedup,
+                          but also incorrect code with some gcc versions on
+                          some processors (default disabled).
+  --enable-direct-threaded      Force direct threading. This may not work on
+                                some machines and may cause slowdown on others.
+                                (default processor-dependent)
+  --enable-indirect-threaded    Force indirect threading. This can cause a
+                                slowdown on some machines.
+                                (default processor-dependent)
+  --with-debug     specifies option -g to compile with debug info (default)
+   --without-debug  omits the -g switch and creates smaller images on
+                    machines where strip has problems with gcc style
+                    debugging informations.
+  --help: tells you about other parameters.
+
+If you don't like the defaults for the installation directories, you
+should override them already during configure.  E.g., if you want to
+install in the /gnu hierarchy instead of in the default /usr/local
+hirarchy, say
 
---help: tells you about other parameters.
+./configure --prefix=/gnu
 
-Now type
+After, configuration, type
 
 make
 
 If your make has trouble with the Makefile, "make gforth" might work.
 
-If your installed gcc isn't called "gcc" (eg. called "gcc-2.6.1"), type
+If your installed gcc isn't called "gcc" (e.g., called "gcc-2.6.1"), type
 
-make CC=<whatever you call your gcc>
+make GCC=<whatever you call your gcc>
 
 instead.
 
+Now you can check whether your shiny new Forth system works. Say
+
+make test
+
 To make the documentation, type
 
 make -k gforth.info gforth.ps html
+
+If everything is allright, you may want to install gforth. Type
+
+make install
+
+You have to make an entry in the info directory file manually. Also,
+you have to install gforth.ps and html yourself.
+
+
+A possible problem:
+
+You need to read this only if you see a message like
+
+"gforth: Cannot load nonrelocatable image (compiled for address 0x1234) at address 0x5678
+The Gforth installer should look into the INSTALL file"
+
+Gforth supports relocatable and fixed-address images. If you load
+normal Forth code and save the image, you get a fixed-address
+image. Producing a relocatable image is more difficult.
+
+Consequently, Gforth has only a relocatable image of the kernel
+(kernal.fi), which is powerful enough to load the rest of
+Gforth. However, loading the rest takes a noticable amount of time. To
+avoid this delay on every startup,the installation procedure produces
+an image fixed at an address determined at the Gforth run that
+produced the image. This fixed-address image is loaded by default. On
+most OSs this works, because the first chunk of memory is always
+allocated at the same address. If the address changes, you get the
+message above.
+
+An image address change can be caused by a change of the gforth
+executable, or by a change (upgrade) of the OS; in these cases you
+just have to rebuild and reinstall the fixed address image with
+
+rm gforth.fi; make gforth.fi; make install
+
+If you get such a message with a different address in place of the
+0x5678 each time you try to start gforth, you cannot use fixed-address
+images on your OS. In this case, send us a message so that we start
+searching for a comfortable solution to this problem. In the
+meantime, start gforth with
+
+gforth -i kernal.fi startup.fs
+