Re: Makefile: How to create "eqn.cpp" and "eqn.hpp" as they are not rebuilt when removed

[Bjarni Ingi Gislason]

  Fixing the compilation.

  The program "bison" needs the option "-y" to name its output files in
the same way as "byacc" does, that is, according to the "POSIX yacc".

  So use

export YACC='bison -y'