Apparently my edit this time was unsuccessful, tons of error messeages showed up when I ran "make -j" command in working directory. However this commit is mainly for education purposes, it's so that Miikka (main) and others can see what I changed easily and can use as teaching reference.

acc/mhd_solver/stencil_defines.h

@@ -72,6 +72,12 @@
         FUNC(AC_star_pos_y),\
         FUNC(AC_star_pos_z),\
         FUNC(AC_M_star),\
+        /* properties of sink particle*/\
+	FUNC(AC_sink_pos_x),\             
+	FUNC(AC_sink_pos_y),\
+	FUNC(AC_sink_pos_z),\
+	FUNC(AC_M_sink),\
+	//The above is function for sink particle, not sure if it's supposed to be here but just a try
         /* Run params */\
         FUNC(AC_cdt), \
         FUNC(AC_cdtv), \