libpam0g-dev 1.1.3-2ubuntu1 (amd64 binary) in ubuntu oneiric

 Contains C header files and development shared libraries for libpam, the
 pluggable authentication modules, a suite of shared libraries that enable
 the local system administrator to choose how applications authenticate
 users.
 .
 PAM decouples applications from the authentication mechanism, making it
 possible to upgrade the authentication system without recompiling or
 rewriting the applications.