diff --git a/common.mk b/common.mk
index 3fddf49..92f3e3c 100644
--- a/common.mk
+++ b/common.mk
@@ -1,18 +1,27 @@
 # -*- makefile-bsdmake -*-
 INPUTS=sample.txt input.txt
-SCHEMES=chicken guile chibi racket gauche loko skint
-all: $(SCHEMES)
+SCHEMES=chibi chicken gauche guile loko racket skint
+all: ${SCHEMES}
+benchmark:
+	@i=0; \
+	for scheme in ${SCHEMES}; do \
+		tput setaf $$i; \
+		printf %8s $$scheme; \
+		tput sgr0; \
+		: $$((i+=1)); \
+		time ${MAKE} $$scheme >/dev/null; \
+	done
 chicken: main.scm
-	csi -script main.scm $(INPUTS)
+	csi -script main.scm ${INPUTS}
 guile: main.scm
-	guile --no-auto-compile main.scm $(INPUTS)
+	guile --no-auto-compile main.scm ${INPUTS} 2>/dev/null
 chibi: main.scm
-	chibi-scheme main.scm $(INPUTS)
+	chibi-scheme main.scm ${INPUTS}
 racket: main.scm
-	racket -I r7rs --script main.scm $(INPUTS)
+	racket -I r7rs --script main.scm ${INPUTS}
 gauche: main.scm
-	gosh main.scm $(INPUTS)
+	gosh main.scm ${INPUTS}
 loko: main.scm
-	loko --script main.scm $(INPUTS)
+	loko --script main.scm ${INPUTS}
 skint: main.scm
-	skint --script main.scm $(INPUTS)
+	skint --script main.scm ${INPUTS}