Integrate Maxima build into ASDF configuration

README

@@ -21,22 +21,21 @@ To then run the simulation:
 
 								SETUP
 
-Before the ASDF system can be loaded, you must build the Maxima
-sources locally and install them into a directory (I couldn't get
-Maxima's ASDF system to load successfully otherwise, though I'm not
-entirely sure why this fixes it).  This can be done with:
+If you have :sdl2 available and the sources are in ASDF's registry,
+loading the system should just work™:
 
-	cd maxima
-	mkdir $PWD-install
-	./bootstrap
-	./configure --prefix=$PWD-install
-	make -j
-	make install
+	(asdf:load-system :ham)
 
-I'll try to figure out if this step itself can be done with ASDF at
-some point ;)
+Otherwise, the full process fetching :sdl2 with Quicklisp and adding
+the current directory to ASDF's registry is
 
-Once that's done you should be able to load the system with
-(asdf:load-system :ham), given that the sources are in your ASDF
-registry.  The system also uses :sdl2, so make sure that's available
--- you can get it with (ql:quickload :sdl2) if you're so inclined.
+	(ql:quickload :sdl2)
+	(push *default-pathname-defaults* asdf:*central-registry*)
+	(asdf:load-system :ham)
+
+Maxima ended up being a bit of a pain to build fully within ASDF so
+the ASDF config first compiles it with its autotools set-up (so you'll
+need autoconf et al) and uses the FASLs from that build when possible.
+It's a little cursed but it does the job.  I did have to call
+asdf::mark-operation-done directly so it might break with future
+versions of ASDF (I'm using version 3.3.1 at time of writing).