scc

 1#!/bin/sh
 2
 3trap 'rm -f f1.? $tmp1' EXIT
 4trap 'exit $?' HUP INT TERM
 5
 6tmp1=tmp1.$$
 7
 8$EXEC scc make -f- <<'EOF' > $tmp1 2>&1
 9all: f1.o
10
11f1.o: f1.c
12	touch $@
13
14f1.c:
15	touch $@
16EOF
17
18diff $tmp1 - <<EOF
19touch f1.c
20touch f1.o
21EOF