samw@spacecat ~ % paludis -ip nvidia-drivers
Building target list... paludis@1175984171: [WARNING] In program paludis -ip nvidia-drivers:
  ... When performing install action from command line:
  ... When adding install target 'nvidia-drivers':
  ... When disambiguating package name 'nvidia-drivers':
  ... When looking in repository 'gentoo':
  ... When using name cache at '/usr/portage/.cache/names/gentoo':
  ... Names cache for 'gentoo' has no version information, so cannot be used. Either it was generated using an older Paludis version or it has not yet been generated.
paludis@1175984171: [WARNING] In program paludis -ip nvidia-drivers:
  ... When performing install action from command line:
  ... When adding install target 'nvidia-drivers':
  ... When disambiguating package name 'nvidia-drivers':
  ... When looking in repository 'enlightenment':
  ... When using name cache at '/usr/portage/local/layman/enlightenment/.cache/names/enlightenment':
  ... Names cache for 'enlightenment' has no version information, so cannot be used. Either it was generated using an older Paludis version or it has not yet been generated.
paludis@1175984171: [WARNING] In program paludis -ip nvidia-drivers:
  ... When performing install action from command line:
  ... When adding install target 'nvidia-drivers':
  ... When disambiguating package name 'nvidia-drivers':
  ... When looking in repository 'xeffects':
  ... When using name cache at '/usr/portage/local/layman/xeffects/.cache/names/xeffects':
  ... Names cache for 'xeffects' has no version information, so cannot be used. Either it was generated using an older Paludis version or it has not yet been generated.

Building dependency list...
Query error:
  * In program paludis -ip nvidia-drivers:
  * When performing install action from command line:
  * When executing install task:
  * When adding PackageDepSpec 'x11-drivers/nvidia-drivers':
  * When adding package 'x11-drivers/nvidia-drivers-1.0.9755-r1::gentoo':
  * When adding build dependencies as pre dependencies:
  * When adding PackageDepSpec 'virtual/linux-sources':
  * All versions of 'virtual/linux-sources' are masked. Candidates are:
    * virtual/linux-sources-2.4.32-r7::virtuals: Masked by keyword, user_mask, repository_mask, by_association
    * virtual/linux-sources-2.6.15-r1::virtuals: Masked by user_mask, by_association
    * virtual/linux-sources-2.6.16-r13::virtuals: Masked by user_mask, by_association
    * virtual/linux-sources-2.6.17-r9::virtuals: Masked by user_mask, by_association
    * virtual/linux-sources-2.6.18::virtuals: Masked by user_mask, by_association
    * virtual/linux-sources-2.6.18-r7::virtuals: Masked by user_mask, by_association
    * virtual/linux-sources-2.6.19::virtuals: Masked by user_mask, by_association
    * virtual/linux-sources-2.6.19-r1::virtuals: Masked by user_mask, by_association
    * virtual/linux-sources-2.6.19-r2::virtuals: Masked by user_mask, by_association
    * virtual/linux-sources-2.6.19-r3::virtuals: Masked by user_mask, by_association
    * virtual/linux-sources-2.6.19-r4::virtuals: Masked by user_mask, by_association
    * virtual/linux-sources-2.6.19-r5::virtuals: Masked by user_mask, by_association
    * virtual/linux-sources-2.6.19-r6::virtuals: Masked by user_mask, by_association
    * virtual/linux-sources-2.6.19-r7::virtuals: Masked by user_mask, by_association
    * virtual/linux-sources-2.6.20::virtuals: Masked by user_mask, by_association
    * virtual/linux-sources-2.6.20-r1::virtuals: Masked by user_mask, by_association
    * virtual/linux-sources-2.6.20-r2::virtuals: Masked by user_mask, by_association
    * virtual/linux-sources-2.6.20-r3::virtuals: Masked by user_mask, by_association
    * virtual/linux-sources-2.6.20-r4::virtuals: Masked by user_mask, by_association