cygwin warning:
  MS-DOS style path detected: d:\Documentos\GNS3\proyectos\RIPOSPF\project-files\dynamips
  Preferred POSIX equivalent is: /cygdrive/d/Documentos/GNS3/proyectos/RIPOSPF/project-files/dynamips
  CYGWIN environment variable option "nodosfilewarning" turns off this warning.
  Consult the user's guide for more details about POSIX paths:
    http://cygwin.com/cygwin-ug-net/using.html#using-pathnames
