pp.cmi: ast.cmi 
pp.cmo: ast.cmi pp.cmi 
pp.cmx: ast.cmi pp.cmi 
macro.cmo: macro.cmi 
macro.cmx: macro.cmi 
lexer.cmo: macro.cmi lexer.cmi 
lexer.cmx: macro.cmx lexer.cmi 
parser.cmo: ast.cmi lexer.cmi 
parser.cmx: ast.cmi lexer.cmx