portage-ng / portage / sci-astronomy / psfex / 3.17.1
pmerge --pretend --verbose
[ebuild  N     ] sci-libs/atlas-3.11.41::gentoo USE="lapack threads -doc -fortran -generic -static-libs" 6.3 MiB
[ebuild  N     ] sci-libs/fftw-3.3.10-r1:3.0/3::gentoo USE="openmp threads -doc -fortran -mpi -test (-zbus)" CPU_FLAGS_X86="avx avx2 fma3 sse sse2 -fma4" 4.0 MiB
[ebuild  N     ] sci-astronomy/psfex-3.17.1::gentoo USE="threads -doc -plplot" 2.3 MiB

Total: 3 packages (3 new), Size of downloads: 12.5 MiB


 * Running sanity checks...
>>> sci-libs/fftw-3.3.10-r1: failed pkg_pretend
 /Volumes/Disk 1/gentoo-prefix/usr/lib/pkgcore/lib/pkgcore/ebd/.generated/libs/8/pkg_pretend: line 144: [[: invalid regular expression `': empty (sub)expression
  * ERROR: sci-libs/fftw-3.3.10-r1:: failed (pretend phase):
  *   USE flag 'openmp' not in IUSE for sci-libs/fftw-3.3.10-r1
  * 
  * Call stack:
  *    isolated-functions.bash, line  333:  called pkg_pretend
  *                ebuild.bash, line 2167:  called use 'openmp'
  *                pkg_pretend, line  145:  called die
  * 
  * Working directory: '/var/tmp/portage'

!!! Sanity checks failed, exiting...

Wall time
0.737 s vs. 0.040 s for portage-ng