diff --git a/sch2fig/Makefile b/sch2fig/Makefile
index 62a1ce1..67749e2 100644
--- a/sch2fig/Makefile
+++ b/sch2fig/Makefile
@@ -18,21 +18,35 @@ LIBS = -lm
 
 include ../common/Makefile.c-common
 
-.PHONY:		test neo900 test diff view newref
+.PHONY:		test neo900 sch test diff view newref
 
 all::		$(NAME)
 
 $(NAME):	$(OBJS)
 		$(CC) -o $(NAME) $(OBJS) $(LIBS)
 
-NEO900_HW = ../../../n9/ee/hw
-KICAD_LIBS = ../../kicad-libs/components
+#----- Test sheet -------------------------------------------------------------
 
 sch:
 		eeschema test.sch
 
 test:		$(NAME)
 		./$(NAME) test.lib test.sch >out.fig
+		fig2dev -L png -m 2 out.fig _out.png
+		[ ! -r ref.png ] || \
+		    ! compare -metric AE ref.png _out.png _diff.png || \
+		    qiv -t -R -D _diff.png ref.png _out.png
+
+testref:
+		./$(NAME) test.lib test.sch | fig2dev -L png -m 2 >ref.png
+
+clean::
+		rm -f out.fig _out.png _diff.png
+
+#----- Render Neo900 schematics -----------------------------------------------
+
+NEO900_HW = ../../../n9/ee/hw
+KICAD_LIBS = ../../kicad-libs/components
 
 SHEET ?= 12
 
@@ -47,6 +61,8 @@ neo900.pdf:	$(NAME) sch2pdf neo900-template.fig
 		    $(NEO900_HW)/neo900.lib $(KICAD_LIBS)/powered.lib \
 		    $(NEO900_HW)/neo900.sch
 
+#----- Regression test based on Neo900 schematics -----------------------------
+
 diff:		$(NAME)
 		test/genpng test out
 		test/comp test || $(MAKE) view