- { "f", HAS_ARG, {(void*)opt_format}, "force format", "format" },
- { "of", HAS_ARG, {(void*)&opt_output_format}, "output the document either as ini or json", "output_format" },
- { "unit", OPT_BOOL, {(void*)&show_value_unit},
+ { "f", HAS_ARG, {.func_arg = opt_format}, "force format", "format" },
+ { "of", HAS_ARG, {.func_arg = opt_output_format}, "output the document either as ini or json", "output_format" },
+ { "unit", OPT_BOOL, {&show_value_unit},