Gentoo's Bugzilla –
Attachment 636290 Details for
Bug 721136app-text/texlive-core-2019-r11 w/ app-text/poppler-0.88.0: texk/web2c/pdftexdir/pdftosrc.cc:81:37: error: no match for 'operator=' (operand types are 'std::unique_ptr<GlobalParams>' and 'GlobalParams*')