Package: cl-mcclim Version: 0.9.2.dfsg.1-2 Severity: grave cl-mcclim 0.9.5 has a dependency on cl-flexichain, which apparently exists only in experimental. sudo aptitude safe-upgrade ... The following packages are BROKEN: cl-mcclim ... The following packages have unmet dependencies: cl-mcclim: Depends: cl-flexichain which is a virtual package. -- System Information: Debian Release: lenny/sid APT prefers unstable APT policy: (500, 'unstable'), (500, 'testing') Architecture: amd64 (x86_64) Kernel: Linux 2.6.22-1-amd64 (SMP w/2 CPU cores) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/bash Versions of packages cl-mcclim depends on: ii cl-clx-sbcl 0.7.2-1 An X11 Common Lisp client library ii cl-spatial-trees 0.2-1 Spatial trees Common Lisp library ii cmucl-source 19d-20061116-2 The CMUCL lisp sources ii common-lisp-controller 6.11 Common Lisp source and compiler ma cl-mcclim recommends no packages. -- no debconf information