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

Calculating dependencies ... done!
Dependency resolution took 0.85 s (backtrack: 1/20).


!!! All ebuilds that could satisfy "sci-libs/pgplot" have been masked.
!!! One of the following masked packages is required to complete your request:
- sci-libs/pgplot-5.2.2-r9::gentoo (masked by: free-noncomm license(s))
A copy of the 'free-noncomm' license is located at '/Volumes/Disk 1/Repository/portage-git/licenses/free-noncomm'.

- sci-libs/pgplot-5.2.2-r8::gentoo (masked by: free-noncomm license(s))

(dependency required by "dev-perl/PGPLOT-2.280.0::gentoo" [ebuild])
(dependency required by "=dev-perl/PGPLOT-2.280.0" [argument])
For more information, see the MASKED PACKAGES section in the emerge
man page or refer to the Gentoo Handbook.