src/mk2make - plan9 - Git at Google

 #!/bin/sh

 sed -E '
 	s/\$([a-zA-Z0-9_][a-zA-Z0-9_]+)/$(\1)/g
 	s/^</include /
 	/^include / s/mk/Make/g
 ' "$@"
	#!/bin/sh

	sed -E '
	s/\$([a-zA-Z0-9_][a-zA-Z0-9_]+)/$(\1)/g
	s/^</include /
	/^include / s/mk/Make/g
	' "$@"