Build fails with nlopt-2.9.0: error: use of undeclared identifier 'NLOPT_LD_LBFGS_NOCEDAL'

[yurivict]

In file included from src/solvers/nlopt_optimization_solver.C:29:
./include/libmesh/nlopt_optimization_solver.h:189:41: error: use of undeclared identifier 'NLOPT_LD_LBFGS_NOCEDAL'
  189 |     ret["LD_LBFGS_NOCEDAL"]           = NLOPT_LD_LBFGS_NOCEDAL;
      |                                         ^

Version: 1.7.6

[roystgnr]

Thanks for reporting this!

Looks like the problem here isn't the libMesh version, it's the nlopt version. They just removed that enum 2 weeks ago, in stevengj/nlopt@f4e74eb#diff-7447dda2c1e8a9fd889796fb62786af1ca90c46ddc0cde8818e7eabd757c4e0e

We'll get a fix into master and the upcoming 1.8.x releases, but for libMesh 1.7.6 it's probably best to just configure libMesh with --disable-nlopt if your only available version of that is the newest.