src/make2mk - plan9 - Git at Google

 #!/bin/sh

 sed -E '
 	s/\$\(([^)]+)\)/$\1/g
 	s/^(.*)\+=/\1=$\1 /g
 	s/^include /</g
 	/^</ s/Make/mk/g
 ' "$@"
	#!/bin/sh

	sed -E '
	s/\$\(([^)]+)\)/$\1/g
	s/^(.*)\+=/\1=$\1 /g
	s/^include /</g
	/^</ s/Make/mk/g
	' "$@"