Gentoo's Bugzilla –
Attachment 282891 Details for
Bug 378723x11-terms/rxvt-unicode-9.12-r1 USE=perl with perl-core/ExtUtils-ParseXS-3 - Cannot open '$PERL <iom_perl.xs -pe s/IOM_MODULE/urxvt/g,s/IOM_CLASS/urxvt/g |': No such file or directory in rxvtperl.xs, line 1899