make: "echo word; false" returned non-zero status make: "echo word; false" returned non-zero status Global: _ = Var_Parse: ${:!echo word; ${:Ufalse}!} (eval-keep-dollar-and-undefined) Evaluating modifier ${:!...} on value "" (eval-keep-dollar-and-undefined, undefined) Modifier part: "echo word; false" Capturing the output of command "echo word; false" make: "echo word; false" returned non-zero status Result of ${:!echo word; ${:Ufalse}!} is "word" (eval-keep-dollar-and-undefined, defined) Global: _ = word Global: .MAKEFLAGS = -r -k -d v -d Global: .MAKEFLAGS = -r -k -d v -d 0 exit status 0