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
 9F = World
10G = Hello
11
12all:
13	@echo $G $(F)!
14EOF
15
16diff $tmp1 - <<EOF
17Hello World!
18EOF