1make: "var-op-shell.mk" line 28: warning: "echo "failed"; false" returned non-zero status 2make: "var-op-shell.mk" line 34: warning: "false" returned non-zero status 3make: "var-op-shell.mk" line 59: warning: "kill -14 $$" exited on a signal 4/bin/no/such/command: not found 5make: "var-op-shell.mk" line 65: warning: "/bin/no/such/command" returned non-zero status 6stderr 7exit status 0 8