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/usr/lib/x86_64-linux-gnu/octave/packages/optim-1.3.0/x86_64-pc-linux-gnu-api-v49+/PKG_ADD is in octave-optim 1.3.0-1.

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if (compare_versions (version (), "3.3.55", ">="))
  ## optimset mechanism was fixed for option names with underscores
  ## sometime in 3.3.54+, if I remember right
  __all_opts__ ("nonlin_residmin");
  __all_opts__ ("residmin_stat");
  __all_opts__ ("nonlin_min");
endif