# emerge -auv dev-perl/Math-Vec 

These are the packages that would be merged, in order:

Calculating dependencies -
!!! All ebuilds that could satisfy "dev-perl/Math-Vec" have been masked.
!!! One of the following masked packages is required to complete your request:
- dev-perl/Math-Vec-1.01 (masked by: missing keyword)

For more information, see MASKED PACKAGES section in the emerge man page or 
refer to the Gentoo Handbook.

iyn ~ # eix dev-perl/Math-Vec
* dev-perl/Math-Vec
     Available versions:  ~*1.01
     Homepage:            http://search.cpan.org/~ewilhelm/Math-Vec/
     Description:         vectors for perl