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

Calculating dependencies ... done!
Dependency resolution took 3.30 s (backtrack: 5/20).

[ebuild  r  UD ] net-libs/libnsl-1.3.0-r2:0/2::gentoo [2.0.1:0/3::gentoo] USE="-static-libs" 314 KiB
[ebuild  rR    ] app-text/opensp-1.5.2-r10::gentoo  USE="nls -doc -static-libs -test" 1486 KiB

Total: 2 packages (1 downgrade, 1 reinstall), Size of downloads: 1800 KiB

WARNING: One or more updates/rebuilds have been skipped due to a dependency conflict:

net-libs/libnsl:0

  (net-libs/libnsl-2.0.1:0/3::gentoo, ebuild scheduled for merge) USE="-static-libs" conflicts with
    =net-libs/libnsl-1.3.0-r2


The following packages are causing rebuilds:

  (net-libs/libnsl-1.3.0-r2:0/2::gentoo, ebuild scheduled for merge) causes rebuilds for:
    (app-text/opensp-1.5.2-r10:0/0::gentoo, ebuild scheduled for merge)