As GNU binutils windres uses getopt for option parsing, it accepts any unique abbreviation of the long options. For now just look for this particular abbreviation instead of any potential one, as there's at least one existing use in the wild of --include: https://github.com/tcltk/tcl/blob/fe69f643609d633facf249c9c963ce121153a8ff/win/tcl.m4#L640