c_g_option_group_new

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
GOptionGroup* function(const(char)* name, const(char)* description, const(char)* helpDescription, void* userData, GDestroyNotify destroy) c_g_option_group_new;

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