This is the final situation: With the 2.3.1-16 testing version of libc6 the problem is NOT solved
I've downgraded to 2.2.15 -11.5 version of libc6 (from http://security.debian.org stable/updates/main Packages ) and the problem is dissapeared. (by the way, the upgrade of the lib6 was due to a probe of a Tcl/Tk from the testing branch) Thanks to both Chris and Paul, and thanks to all guys that maintain the debian documentation. ------------------------------ Jaime Cervera Bravo <[EMAIL PROTECTED]> Escuela Técnica Superior de Arquitectura Universidad Politécnica de Madrid ------------------------------