<div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">so why dont you install the build deps for clisp then instead of the ones for clips ? ;) </blockquote><div> Opps ? :P </div></div> but the problem still exists, I mean, if somebody wants to install clisp It won't be able to do that due to the  xlibs predependency: ceruno@cinto:~$ sudo apt-get install clisp (...) Since you only requested a single operation it is extremely likely that the package is simply not installable and a bug report against that package should be filed. The following information may help to resolve the situation: The following packages have unmet dependencies:   clisp: Depends: common-lisp-controller (>= 4.23) but it is not going to be installed          PreDepends: xlibs but it is not installable E: Broken packages ceruno@cinto:~$ sudo apt-get install xlibs Reading package lists... Done Building dependency tree... Done Package xlibs is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source However the following packages replace it:   libxft1 xkeyboard-config E: Package xlibs has no installation candidate Thanks Again. Miguel.