Thanks Marco for both your your patience and prompt answer, here's some additional info.
The directory list under \cygwin\usr is: i686-pc- cygwin include local sbin share src ssl tmp And is not including /bin. The only one I found is /cygwin/bin, as it has been created right under the root installation directory and not under /usr. Reading the lapack0.sh content I found that: LA_PREFIX=/usr LA_LIBDIR=${LA_PREFIX} /lib LA_BINDIR=${LA_LIBDIR}/lapack So "/usr/lib/lapack" is actually NOT missing from PATH, but correct path should not have /usr as prefix in my particular case, isn't it? So strange since it's default directory structure created by setup.exe (during installation I chose C: \Users\gennarif\Documents\programmi\cygwin\ as root directory). Add to this, trying to produce the requested file, I got this error: cygcheck -s -v -r > cygcheck.out cygcheck: Wrong architecture. Only ix86 executables supported. Dis some mis-installation happen? Thanks & regards, Federico Invita i tuoi amici e Tiscali ti premia! Il consiglio di un amico vale più di uno spot in TV. Per ogni nuovo abbonato 30 € di premio per te e per lui! Un amico al mese e parli e navighi sempre gratis: http://freelosophy.tiscali.it/ -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple