Gentoo's Bugzilla –
Attachment 532218 Details for
Bug 656108app-text/pdf2htmlEX-0.14.6.2 with app-text/poppler-0.64.0 : /.../CairoOutputDev.h:190:8: error: void CairoOutputDev::beginString(GfxState*, GooString*) marked override , but does not override