As Uwe Ligges-3 guessed, i am working on a Windows Station. I also tried the link Uwe Ligges-3 posted and I think it worked Thank you all for your answers! -- View this message in context: http://r.789695.n4.nabble.com/Installing-HDF5-package-tp4639633p4639728.html Sent from the R help mailing list archive at Nabble.com.