>>> Emerging : portage://sci-libs/netcdf-cxx-4.2-r301:run?{[]}

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

Calculating dependencies... done!

 └─step  1─┤ useflag portage://sci-libs/hdf5-2.2.0 (-threads)

 └─step  2─┤ download  portage://dev-libs/libzip-1.12.1
             │           └─ file ─┤ 794.32 Kb  	 libzip-1.12.1.tar.xz
             │ download  portage://sci-libs/hdf5-2.2.0
             │           └─ file ─┤ 40.18 Mb  	 hdf5-2.2.0.tar.gz
             │ download  portage://sci-libs/netcdf-4.10.1-r1
             │           └─ file ─┤ 12.74 Mb  	 netcdf-c-4.10.1.tar.gz
             │ download  portage://sci-libs/netcdf-cxx-4.2-r301
             │           └─ file ─┤ 686.99 Kb  	 netcdf-cxx-4.2.tar.gz

 └─step  3─┤ install   portage://dev-libs/libzip-1.12.1
             │           └─ conf ─┤ USE = "bzip2 ssl -gnutls -lzma -test -tools -zstd"
             │                    │ SLOT = "0/5"
             │ install   portage://sci-libs/hdf5-2.2.0 (USE modified)
             │           └─ conf ─┤ USE = "-threads zlib hl -cxx -debug -fortran -mpi -szip -test -unsupported"
             │                    │ SLOT = "0/320-cmake"

 └─step  4─┤ run       portage://dev-libs/libzip-1.12.1
             │ run       portage://sci-libs/hdf5-2.2.0 (USE modified)

 └─step  5─┤ install   portage://sci-libs/netcdf-4.10.1-r1
             │           └─ conf ─┤ USE = "bzip2 dap hdf5 -blosc -doc -examples -hdf -logging -mpi -szip -test -zstd"
             │                    │ SLOT = "0/22"

 └─step  6─┤ run       portage://sci-libs/netcdf-4.10.1-r1

 └─step  7─┤ install   portage://sci-libs/netcdf-cxx-4.2-r301
             │           └─ conf ─┤ USE = "-examples"
             │                    │ SLOT = "3"

 └─step  8─┤ run     portage://sci-libs/netcdf-cxx-4.2-r301

Total: 13 actions (1 useflag, 4 downloads, 4 installs, 4 runs), grouped into 8 steps.
       54.37 Mb to be downloaded.


>>> Assumptions taken during proving & planning:

  USE flag change (1 package):
  Add to /etc/portage/package.use:
    sci-libs/hdf5 -threads