pmerge --pretend --verbose
[ebuild N ] dev-lang/mlton-20180207:0/20180207::gentoo USE="-binary -bootstrap-smlnj -doc -pax-kernel -stage3" 41.7 MiB
Total: 1 package (1 new), Size of downloads: 41.7 MiB
* Running sanity checks...
>>> dev-lang/mlton-20180207: failed pkg_pretend
/Volumes/Disk 1/gentoo-prefix/usr/lib/pkgcore/lib/pkgcore/ebd/.generated/libs/7/pkg_pretend: line 145: [[: invalid regular expression `': empty (sub)expression
* ERROR: dev-lang/mlton-20180207:: failed (pretend phase):
* USE flag 'binary' not in IUSE for dev-lang/mlton-20180207
*
* Call stack:
* isolated-functions.bash, line 333: called pkg_pretend
* ebuild.bash, line 1627: called use '!binary'
* pkg_pretend, line 146: called die
*
* Working directory: '/var/tmp/portage'
!!! Sanity checks failed, exiting...
- Wall time
- 0.700 s vs. 0.004 s for portage-ng