portage-ng / portage / media-libs / opensubdiv / 3.6.0-r4
pmerge --pretend --verbose
[ebuild  N     ] media-libs/opensubdiv-3.6.0-r4::gentoo USE="X opengl openmp python -cuda -doc -examples -glfw -opencl -ptex -tbb -test -tutorials" 38.9 MiB

Total: 1 package (1 new), Size of downloads: 38.9 MiB


 * Running sanity checks...
>>> media-libs/opensubdiv-3.6.0-r4: 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: media-libs/opensubdiv-3.6.0-r4:: failed (pretend phase):
  *   USE flag 'openmp' not in IUSE for media-libs/opensubdiv-3.6.0-r4
  * 
  * Call stack:
  *    isolated-functions.bash, line  333:  called pkg_pretend
  *                ebuild.bash, line 2543:  called use 'openmp'
  *                pkg_pretend, line  145:  called die
  * 
  * Working directory: '/var/tmp/portage'

!!! Sanity checks failed, exiting...

Wall time
0.759 s vs. 0.030 s for portage-ng