portage-ng / portage / sci-libs / sundials / 7.3.0
pmerge --pretend --verbose
[ebuild  N     ] sci-libs/sundials-7.3.0:0/7::gentoo USE="int64 openmp static-libs threads -doc -fortran -hypre -lapack -mpi -sparse -superlumt" 88.1 MiB

Total: 1 package (1 new), Size of downloads: 88.1 MiB


 * Running sanity checks...
>>> sci-libs/sundials-7.3.0: 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/sundials-7.3.0:: failed (pretend phase):
  *   USE flag 'openmp' not in IUSE for sci-libs/sundials-7.3.0
  * 
  * Call stack:
  *    isolated-functions.bash, line  333:  called pkg_pretend
  *                ebuild.bash, line 1985:  called use 'openmp'
  *                pkg_pretend, line  145:  called die
  * 
  * Working directory: '/var/tmp/portage'

!!! Sanity checks failed, exiting...

Wall time
0.733 s vs. 0.012 s for portage-ng