[ebuild     U  ] dev-lang/perl-5.42.2:0/5.42::gentoo [5.42.0-r1:0/5.42::gentoo] USE="gdbm -berkdb -doc -minimal" PERL_FEATURES="ithreads (-debug) -quadmath" 13.9 MiB
[ebuild  N     ] virtual/perl-Module-CoreList-5.202.603.30::gentoo

Total: 2 packages (1 new, 1 upgrade), Size of downloads: 13.9 MiB


 * Running sanity checks...
>>> dev-lang/perl-5.42.2: 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: dev-lang/perl-5.42.2:: failed (pretend phase):
  *   USE flag 'perl_features_ithreads' not in IUSE for dev-lang/perl-5.42.2
  * 
  * Call stack:
  *    isolated-functions.bash, line  333:  called pkg_pretend
  *                ebuild.bash, line 1835:  called use 'perl_features_ithreads'
  *                pkg_pretend, line  145:  called die
  * 
  * Working directory: '/var/tmp/portage'

!!! Sanity checks failed, exiting...