Linker command files

"operator-(GRBLinExpr const&)", referenced from:
      szx::MpSolverGurobi::setSubObjective(szx::MpSolverGurobi::SubObjective) in MpSolverGurobi.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)