>>> Emerging : portage://sci-libs/netcdf-fortran-4.6.4: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-lang/cfortran-20210827-r1
             │           └─ file ─┤ 7.91 Kb  	 cfortran_20210827-1.debian.tar.xz
             │                    │ 92.28 Kb  	 cfortran_20210827.orig.tar.gz
             │ 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-fortran-4.6.4
             │           └─ file ─┤ 6.77 Mb  	 netcdf-fortran-4.6.4.tar.gz

Total: 6 actions (1 useflag, 5 downloads), grouped into 2 steps.
       60.56 Mb to be downloaded.


>>> Assumptions taken during proving & planning:

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