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

Calculating dependencies |
!!! All ebuilds that could satisfy "net-wireless/rtl8180" have been masked.
!!! One of the following masked packages is required to complete your request:
- net-wireless/rtl8180-0.22_pre20050528 (masked by: missing keyword)
- net-wireless/rtl8180-0.22_pre20050528-r2 (masked by: missing keyword)

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