>>> Emerging : portage://sci-astronomy/psfex-3.17.1:run?{[]}

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

Calculating dependencies... done!

 └─step  1─┤ useflag portage://sci-libs/atlas-3.11.41 (lapack)

 └─step  2─┤ download  portage://sci-astronomy/psfex-3.17.1
             │           └─ file ─┤ 2.26 Mb  	 psfex-3.17.1.tar.gz
             │ download  portage://sci-libs/atlas-3.11.41
             │           └─ file ─┤ 6.34 Mb  	 atlas3.11.41.tar.bz2
             │ download  portage://sci-libs/fftw-3.3.10-r1
             │           └─ file ─┤ 3.95 Mb  	 fftw-3.3.10.tar.gz

Total: 4 actions (1 useflag, 3 downloads), grouped into 2 steps.
       12.55 Mb to be downloaded.


>>> Assumptions taken during proving & planning:

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