diff --git a/bin/eigenvector2/Makefile b/bin/eigenvector2/Makefile
index 6500128a6..74a415a22 100644
--- a/bin/eigenvector2/Makefile
+++ b/bin/eigenvector2/Makefile
@@ -1,19 +1,10 @@
+.POSIX:
+.SUFFIXES:
+.SUFFIXES: .c
 include ../../conf.mk
-
 M = main
-PREC = s
-CO_CFLAGS = `co.conf --cflags $(PREC)`
-CO_LDFLAGS = `co.conf --libs $(PREC)`
-ALG_LDFLAGS = `alg.conf --libs $(PREC)`
-
-install: $M
-	mkdir -p $(PREFIX)/bin
-	cp main $(PREFIX)/bin/co.eig2
-
-$M: $M.o; $(CC) $< $(LDFLAGS) $(CO_LDFLAGS) $(ALG_LDFLAGS) -o $@
-$M.o: $M.c; $(CC) $(CFLAGS) $(CO_CFLAGS) $< -c -o $@
-
-test: install; atest test/*
-
-.PHONY: clean test install
-clean:; rm -f $M.o $M
+PREC = d
+CO_FLAGS = `co.conf --libs --cflags $(PREC)`
+all: $M
+.c:; $(CC) $< $(CFLAGS) $(CO_FLAGS) -o $@
+clean:; rm -f $M
diff --git a/example/ring/Makefile b/example/ring/Makefile
index c727de0a8..5d9532468 100644
--- a/example/ring/Makefile
+++ b/example/ring/Makefile
@@ -1,29 +1,10 @@
 .POSIX:
+.SUFFIXES:
+.SUFFIXES: .c
 include ../../conf.mk
 M = main normal H
 PREC = d
-CO_CFLAGS = `co.conf --cflags $(PREC)`
-CO_LDFLAGS = `co.conf --libs $(PREC)`
-`co.conf --libs $(PREC)` \
-`alg.conf --libs $(PREC)` \
-`co.conf --libs $(PREC)`
-
-LINK = $(CC)
-
+CO_FLAGS = `co.conf --libs --cflags $(PREC)`
 all: $M
-.o:
-	$(LINK) $< $(LDFLAGS) $(CO_LDFLAGS) -o $@
-
-.c.o:
-	$(CC) $(CFLAGS) $(CO_CFLAGS) $< -c -o $@
-
-.c:
-%: %.c
-
-lint:; make CFLAGS='-Wall -Wextra -g -O2'
-test: $M; atest test/*
-install:
-run: $M; @co.run ./rbc
-
-.PHONY: clean test install run lint
-clean:; rm -f $M $(M:=.o)
+.c:; $(CC) $< $(CFLAGS) $(CO_FLAGS) -o $@
+clean:; rm -f $M