Note that removing --quiet seems to make tests fail, so skip that for now.
--- a/tests/makefile
+++ b/tests/makefile
@@ -5,10 +5,10 @@
 
 # This is what to do by default
 test:
-	@$(MAKE) --quiet tap | ./tapview
+	$(MAKE) --quiet tap | ./tapview
 
 tap:
-	@$(MAKE) --quiet tapstream | tee taplog$$$$; echo "1..$$(grep ok  taplog$$$$ | wc -l)"; rm taplog$$$$
+	$(MAKE) --quiet tapstream | tee taplog$$$$; echo "1..$$(grep ok  taplog$$$$ | wc -l)"; rm taplog$$$$
 
 tapstream: render-regress \
 	gif2rgb-regress \
@@ -37,43 +37,43 @@ PICS = ../pic
 GIF2RGB = ../gif2rgb
 
 $(GIF2RGB):
-	@$(MAKE) -C .. gif2rgb
+	$(MAKE) -C .. gif2rgb
 
 GIFS := $(shell ls ../pic/*.gif)
 
 # Test decompression and rendering by unpacking images,
 # converting them to RGB, and comparing that result to a check file.
 render-regress: $(GIF2RGB)
-	@for test in $(GIFS); \
+	for test in $(GIFS); \
 	do \
 	    stem=`basename $${test} | sed -e "s/.gif$$//"`; \
 	    $(UTILS)/gif2rgb -1 <$${test} | ./cmpdiffer "gif2rgb: test of $${test}" $${stem}.rgb; \
 	done
 render-rebuild: $(GIF2RGB)
-	@for test in $(GIFS); do \
+	for test in $(GIFS); do \
 		stem=`basename $${test} | sed -e "s/.gif$$//"`; \
 		echo "Remaking $${stem}.rgb"; \
 		$(UTILS)/gif2rgb -1 -o $${stem}.rgb $${test}; \
 	done
 
 gif2rgb-regress: $(GIF2RGB)
-	@$(UTILS)/gif2rgb -c 3 -s 100 100 <gifgrid.rgb | $(UTILS)/gifbuild -d | sed "/sort flag/s/off/on/" | ./tapdiffer "checking gif2rgb idempotency" gifgrid.ico
+	$(UTILS)/gif2rgb -c 3 -s 100 100 <gifgrid.rgb | $(UTILS)/gifbuild -d | sed "/sort flag/s/off/on/" | ./tapdiffer "checking gif2rgb idempotency" gifgrid.ico
 gif2rgb-rebuild: $(GIF2RGB)
-	@echo "Rebuilding gif2rgb checkfile."
-	@$(UTILS)/gif2rgb -c 3 -s 100 100 <gifgrid.rgb | $(UTILS)/gifbuild -d >gifgrid.ico
+	echo "Rebuilding gif2rgb checkfile."
+	$(UTILS)/gif2rgb -c 3 -s 100 100 <gifgrid.rgb | $(UTILS)/gifbuild -d >gifgrid.ico
 
 gifbuild-regress:
-	@$(UTILS)/gifbuild -d <$(PICS)/treescap.gif | ./tapdiffer "gifbuild: basic sanity check" treescap.ico
-	@$(UTILS)/gifbuild <$(PICS)/sample.ico | $(UTILS)/gifbuild -d > $@.sample-1.ico; $(UTILS)/gifbuild < $@.sample-1.ico | $(UTILS)/gifbuild -d > $@.sample-2.ico;
-	@./tapdiffer <$@.sample-1.ico "gifbuild: Checking idempotency on an icon file." $@.sample-2.ico; rm $@.sample-?.ico
-	@$(UTILS)/gifbuild -d <$(PICS)/fire.gif > $@.fire1.ico
-	@$(UTILS)/gifbuild < $@.fire1.ico > $@.fire2.gif
-	@$(UTILS)/gifbuild -d < $@.fire2.gif > $@.fire2.ico
-	@./tapdiffer <$@.fire1.ico "gifbuild: Checking idempotency on an animation." $@.fire2.ico
-	@rm -f $@.fire1.ico  $@.fire2.ico $@.fire2.gif
+	$(UTILS)/gifbuild -d <$(PICS)/treescap.gif | ./tapdiffer "gifbuild: basic sanity check" treescap.ico
+	$(UTILS)/gifbuild <$(PICS)/sample.ico | $(UTILS)/gifbuild -d > $@.sample-1.ico; $(UTILS)/gifbuild < $@.sample-1.ico | $(UTILS)/gifbuild -d > $@.sample-2.ico;
+	./tapdiffer <$@.sample-1.ico "gifbuild: Checking idempotency on an icon file." $@.sample-2.ico; rm $@.sample-?.ico
+	$(UTILS)/gifbuild -d <$(PICS)/fire.gif > $@.fire1.ico
+	$(UTILS)/gifbuild < $@.fire1.ico > $@.fire2.gif
+	$(UTILS)/gifbuild -d < $@.fire2.gif > $@.fire2.ico
+	./tapdiffer <$@.fire1.ico "gifbuild: Checking idempotency on an animation." $@.fire2.ico
+	rm -f $@.fire1.ico  $@.fire2.ico $@.fire2.gif
 
 gifclrmp-regress:
-	@for test in $(GIFS); \
+	for test in $(GIFS); \
 	do \
 	    stem=`basename $${test} | sed -e "s/.gif$$//"`; \
 	    if ! $(UTILS)/gifclrmp <$${test} > $@.$${stem}.regress 2>&1; \
@@ -83,74 +83,74 @@ gifclrmp-regress:
 		./tapdiffer <$@.$${stem}.regress "gifclrmap: Checking colormap of $${test}" $${stem}.map; \
 	    fi \
 	done
-	@rm -f $@.*.regress
+	rm -f $@.*.regress
 gifclrmp-rebuild:
-	@for test in $(GIFS); do \
+	for test in $(GIFS); do \
 		stem=`basename $${test} | sed -e "s/.gif$$//"`; \
 		echo "Remaking $${stem}.map"; \
 		$(UTILS)/gifclrmp <$${test} >$${stem}.map; \
 	done
 
 gifecho-rebuild:
-	@echo "Rebuilding gifecho test."
-	@$(UTILS)/gifecho -t "foobar" | $(UTILS)/gifbuild -d >foobar.ico
+	echo "Rebuilding gifecho test."
+	$(UTILS)/gifecho -t "foobar" | $(UTILS)/gifbuild -d >foobar.ico
 gifecho-regress:
-	@$(UTILS)/gifecho -t "foobar" | $(UTILS)/gifbuild -d | ./tapdiffer "gifecho: Testing gifecho behavior" foobar.ico
+	$(UTILS)/gifecho -t "foobar" | $(UTILS)/gifbuild -d | ./tapdiffer "gifecho: Testing gifecho behavior" foobar.ico
 
 giffilter-regress: $(GIF2RGB)
-	@for test in $(GIFS); \
+	for test in $(GIFS); \
 	do \
 	    stem=`basename $${test} | sed -e "s/.gif$$//"`; \
 	    $(UTILS)/giffilter <$${test} | $(UTILS)/gif2rgb | ./cmpdiffer "giffiltr: copy of $${test}" "$${stem}.rgb"; \
 	done
 
 giffix-rebuild:
-	@echo "Rebuilding giffix test."
-	@head --bytes=-20 <$(PICS)/treescap.gif | $(UTILS)/giffix 2>/dev/null | $(UTILS)/gifbuild -d >giffixed.ico
+	echo "Rebuilding giffix test."
+	head --bytes=-20 <$(PICS)/treescap.gif | $(UTILS)/giffix 2>/dev/null | $(UTILS)/gifbuild -d >giffixed.ico
 giffix-regress:
-	@head --bytes=-20 <$(PICS)/treescap.gif | $(UTILS)/giffix 2>/dev/null | $(UTILS)/gifbuild -d | ./tapdiffer "giffix: Testing giffix behavior" giffixed.ico
+	head --bytes=-20 <$(PICS)/treescap.gif | $(UTILS)/giffix 2>/dev/null | $(UTILS)/gifbuild -d | ./tapdiffer "giffix: Testing giffix behavior" giffixed.ico
 
 gifinto-regress:
-	@rm -f $@.giflib.tmp
-	@$(UTILS)/gifinto <$(PICS)/porsche.gif $@.giflib.tmp
-	@if test ! -f $@.giflib.tmp; then echo "not ok - gifinto failed to create a file when it should have."; fi
-	@rm -f $@.giflib.tmp
-	@echo "0123456789" | $(UTILS)/gifinto $@.giflib.tmp 2>/dev/null
-	@if test -f $@.giflib.tmp; \
+	rm -f $@.giflib.tmp
+	$(UTILS)/gifinto <$(PICS)/porsche.gif $@.giflib.tmp
+	if test ! -f $@.giflib.tmp; then echo "not ok - gifinto failed to create a file when it should have."; fi
+	rm -f $@.giflib.tmp
+	echo "0123456789" | $(UTILS)/gifinto $@.giflib.tmp 2>/dev/null
+	if test -f $@.giflib.tmp; \
 	then \
 		echo "not ok - gifinto created a file when it shouldn't have."; \
 	else \
 		echo "ok - gifinto correctly refrained from file creation."; \
 	fi
-	@rm -f $@.giflib.tmp
+	rm -f $@.giflib.tmp
 
 gifsponge-regress: $(GIF2RGB)
-	@for test in $(GIFS); \
+	for test in $(GIFS); \
 	do \
 	    stem=`basename $${test} | sed -e "s/.gif$$//"`; \
 	    $(UTILS)/gifsponge <$${test} | $(UTILS)/gif2rgb | ./cmpdiffer "gifsponge: sink of $${test}" $${stem}.rgb; \
 	done
 
 giftext-regress:
-	@for test in $(GIFS); \
+	for test in $(GIFS); \
 	do \
 	    stem=`basename $${test} | sed -e "s/.gif$$//"`; \
 	    $(UTILS)/giftext <$${test} | ./cmpdiffer "text dump of $${test}" $${stem}.dmp; \
 	done
 giftext-rebuild:
-	@for test in $(GIFS); do \
+	for test in $(GIFS); do \
 		stem=`basename $${test} | sed -e "s/.gif$$//"`; \
 		echo "Remaking $${stem}.dmp"; \
 		$(UTILS)/giftext <$${test} >$${stem}.dmp; \
 	done
 
 giftool-regress: $(GIF2RGB)
-	@$(UTILS)/giftool <$(PICS)/gifgrid.gif | $(UTILS)/gif2rgb | ./cmpdiffer "giftool: expensive copy via giftool" gifgrid.rgb
-	@$(UTILS)/giftool -i on <$(PICS)/treescap-interlaced.gif | $(UTILS)/gif2rgb | ./cmpdiffer "giftool: deinterlace" treescap.rgb
-	@$(UTILS)/giftool -i off <$(PICS)/treescap.gif | $(UTILS)/gif2rgb | ./cmpdiffer "giftool: interlace" treescap-interlaced.rgb
+	$(UTILS)/giftool <$(PICS)/gifgrid.gif | $(UTILS)/gif2rgb | ./cmpdiffer "giftool: expensive copy via giftool" gifgrid.rgb
+	$(UTILS)/giftool -i on <$(PICS)/treescap-interlaced.gif | $(UTILS)/gif2rgb | ./cmpdiffer "giftool: deinterlace" treescap.rgb
+	$(UTILS)/giftool -i off <$(PICS)/treescap.gif | $(UTILS)/gif2rgb | ./cmpdiffer "giftool: interlace" treescap-interlaced.rgb
 
 gifwedge-rebuild:
 	@echo "Remaking the gifwedge test."
-	@$(UTILS)/gifwedge >wedge.gif
+	$(UTILS)/gifwedge >wedge.gif
 gifwedge-regress:
-	@$(UTILS)/gifwedge | ./cmpdiffer "gifwedge: wedge generation." wedge.gif
+	$(UTILS)/gifwedge | ./cmpdiffer "gifwedge: wedge generation." wedge.gif