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

Calculating dependencies ... done!
Dependency resolution took 1.20 s (backtrack: 0/20).

[ebuild  N     ] virtual/fortran-0-r1::gentoo  USE="openmp" 0 KiB
[ebuild  N     ] sci-libs/coinasl-2.1.0::gentoo  1915 KiB
[ebuild  N     ] sci-libs/coinor-utils-2.11.12:0/3::gentoo  USE="bzip2 zlib -blas -doc -glpk -lapack -static-libs -test" 1216 KiB
[ebuild  N     ] sci-libs/openblas-0.3.34::gentoo  USE="openmp -cpudetection -index64 -pthread -relapack -test" 24734 KiB
[ebuild  N     ] sci-libs/coinor-osi-0.108.11:0/1::gentoo  USE="-doc -examples -static-libs -test" 1014 KiB
[ebuild  N     ] sci-libs/coinor-clp-1.17.10:0/1::gentoo  USE="-doc -examples -glpk -metis -mpi -mumps -sparse -static-libs -test" 2132 KiB
[ebuild  N     ] sci-libs/coinor-vol-1.5.4:0/1::gentoo  USE="-doc -examples -static-libs -test" 961 KiB
[ebuild  N     ] sci-libs/coinor-cgl-0.60.9:0/1::gentoo  USE="-doc -examples -static-libs -test" 1262 KiB
[ebuild  N     ] sci-libs/coinor-cbc-2.10.12:0/3::gentoo  USE="-doc -examples -static-libs -test" 1648 KiB
[ebuild  N     ] sci-libs/lapack-3.12.1-r2::gentoo  USE="deprecated flexiblas lapacke -doc -eselect-ldso -index64 -test" 7879 KiB
[ebuild  N     ] sci-libs/flexiblas-3.5.0::gentoo  USE="openblas openmp system-blas -blis -index64 -mkl -tbb -test" 80741 KiB
[ebuild  N     ] sci-libs/blas-lapack-aux-wrapper-6::gentoo  USE="-index64 -test" 10 KiB
[ebuild  N     ] virtual/blas-3.8-r1::gentoo  USE="flexiblas -eselect-ldso -index64" 0 KiB
[ebuild  N     ] virtual/lapack-3.10-r1::gentoo  USE="flexiblas -eselect-ldso -index64" 0 KiB
[ebuild  N     ] sci-libs/ipopt-3.14.4-r1:0/1::gentoo  USE="asl lapack -doc -mpi -mumps -static-libs -test" 1801 KiB
[ebuild  N     ] sci-libs/coinor-bonmin-1.8.8:0/4::gentoo  USE="-doc -test" 1306 KiB
[ebuild  N     ] sci-libs/coinor-couenne-0.5.8-r1:0/1::gentoo  USE="-doc" 1291 KiB

Total: 17 packages (17 new), Size of downloads: 127902 KiB