Update the readme to reflect the new build environment.

README.md

@@ -5,36 +5,13 @@ The "Ass-Backward Calculator" for the Apple //GS - an RPN calculator NDA
 
 [Download a disk image](https://github.com/jeremysrand/abCalc/releases/download/v1.0.1/abCalc.2mg) or [download a SHK file](https://github.com/jeremysrand/abCalc/releases/download/v1.0.1/abCalc.SHK)
 
-The source can be built both from Mac OSX, resulting in a commandline binary which you can run on a Mac and from a //GS.
-To build and execute on a Mac:
+The source code is built using my [Apple //GS Build Pipeline](https://github.com/jeremysrand/Apple2GSBuildPipeline).
+If you setup all of the prerequisites on that project, you should be able to build this on a Mac
+using Xcode.  Failing that, put the source onto a real or emulated GS and build it using ORCA/C.
+However, I no longer have a GS compatible Makefile.  If you look in the git history, you will see that
+in the past, the build could be done using dmake under GNO/ME on a GS.
 
-1. Make sure you have Xcode installed.  If not, grab it from the Mac App store.
-2. Execute "make -f Make.mac"
-3. Run "./abCalc"
-
-In theory, it should work on any POSIX platform like Linux, Solaris, etc but I have not tested it on any other platforms.
-
-To build this on a //GS, you need a number of prerequisites:
-
-1. Orca/C v2.0.1
-2. GNO/ME v2.x
-3. occ - the Orca/C wrapper
-4. dmake
-
-To build this on a //GS, the steps are:
-
-1. Somehow copy the files to your //GS.  Depending on whether you are using a real machine or an emulator, your
-approach here may be different.
-2. Find this line in your ORCACDefs/scrap.h file:
-    extern pascal void PutScrap(unsigned Longint, Word, Pointer) inline(0x0C16,dispatcher);
-and change it to
-    extern pascal void PutScrap(LongWord, Word, Pointer) inline(0x0C16,dispatcher);
-This is a bug in the headers which causes ORCA/C to generate the wrong output.
-3. Once you have the files, you should first execute "dmake fixfiles".  This makes sure all files have the right
-file types.
-4. Execute "dmake"
-
-When done, you will have two binaries.  The abCalc binary is a shell command you can use from GNO/ME:
+The abCalc binary is a shell command you can use from GNO/ME:
 
 ![abCalc Shell Screenshot](/abCalc/screenshots/abCalc.png "abCalc Shell Screenshot")