This FTBFS is caused by a change in behaviour in bison 3.7. There's a proposed fix upstream at
https://github.com/verilator/verilator/pull/2505 which works by telling Bison the correct header name. Rupert
- Bug#966909: verilator: FTBFS: verilog.c:313:10: fatal err... Lucas Nussbaum
- Bug#966909: Fixed upstream Rupert Swarbrick
