'Syntax: ternary operator within if condition block

Please help this noob with basic syntax! I'd like to have macd_buy as my 5th condition if useMACD flag is true. I thought this syntax worked but id doesn't. Which is the most elegant way to add a few "and..." conditions that are flag-dependant? Thank you!

useMACD =  input.bool(false, title="use MACD")

macd_buy = hist<0 and hist[1] < hist

enterLong() =>
    if close < lower
        ta.crossover(fish1,fish2)
         and [my 2nd condition]
         and [my 3rd condition]
         and [my 4th condition]
         and useMACD ? macd_buy : na    // <---- this doesn't work
pine-scriptconditional-operator


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