scc

 1#!/bin/sh
 2
 3trap 'rm -f $tmp1' EXIT
 4trap 'exit $?' HUP INT TERM
 5
 6tmp1=tmp1.$$
 7
 8$EXEC scc make -f- <<'EOF' > $tmp1 2>&1
 9STARGET = all
10
11b.$(STARGET): b$(STARGET)
12	@echo Hello World!
13
14ball:
15	@echo But before!
16EOF
17
18diff -u $tmp1 - <<EOF
19But before!
20Hello World!
21EOF