Source: vice Version: 3.6.1+dfsg-3 Severity: important vice is the only package in the archive building with bison++.
Please change the build dependency to bison or byacc (or make bison the first alternative so that it gets installed on the buildds). Standard bison can regenerate src/monitor/mon_parse.{c,h} and the resulting build is successful. Right now bison++ is not even used during the build (except in the configure.ac check) because the generated files src/monitor/mon_parse.{c,h} are shipped and not rebuilt during the package build. The generated src/monitor/mon_parse.{c,h} shipped in the upstream tarball were generated with byacc.