Modularise octfile compilation a bit

src/Makefile.am

@@ -40,4 +40,12 @@ include $(top_srcdir)/am/global-rules
 
 include $(top_srcdir)/flymake.mk
 
+MKOCTFILE=mkoctfile
+
+bin_PROGRAMS =
+
+.PHONY:
+run-octave: duneevaluate.oct duneminimise.oct
+	octave --path $(abs_builddir) --path $(abs_srcdir)
+
 include $(srcdir)/duneminimise.mk

src/duneminimise.mk

-MKOCTFILE=mkoctfile
-
-bin_PROGRAMS = duneminimise.oct
+bin_PROGRAMS += duneminimise.oct
 
 # this would work if shared libraries were only passed via -L and -l, not directly
 #duneminimise_LINK = libtool --tag=CXX --mode link $(MKOCTFILE) $(AM_LDFLAGS) -o $@
@@ -10,7 +8,3 @@ duneminimise.oct: duneminimise.o
 
 duneminimise.o: duneminimise.cc
 	$(MKOCTFILE) $(AM_CPPFLAGS) -c -o $@ $<
-
-.PHONY:
-run-octave: duneminimise.oct
-	octave --path $(abs_builddir) --path $(abs_srcdir)