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

Calculating dependencies ... done!
Dependency resolution took 1.04 s (backtrack: 0/20).

[ebuild  N     ] dev-cpp/glog-0.6.0-r1:0/1::gentoo  USE="libunwind -gflags -llvm-libunwind -test" 189 KiB
[ebuild  N     ] sci-libs/ceres-solver-2.2.0-r2:0/1::gentoo  USE="schur -cuda -doc -examples -gflags -lapack -sparse -test" 7457 KiB

Total: 2 packages (2 new), Size of downloads: 7646 KiB