Like https://bugs.gentoo.org/show_bug.cgi?id=940672 This package needs to be configured to trigger a rebuild when PERL_FEATURES USE flags are changed. I had to add "ithreads" to my PERL_FEATURES to make sys-process/parallel's parcat tool work, but that didn't trigger a rebuild of x11-terms/rxvt-unicode leaving me with a urxvt and a urxvtd that cannot be run: $ urxvt urxvt: symbol lookup error: urxvt: undefined symbol: PL_sv_immortals $ urxvtd urxvtd: symbol lookup error: urxvtd: undefined symbol: PL_sv_immortals o/ emanuele6