该命令$ make all会给出错误，例如rm: cannot remove '.lambda': No such file or directory它会停止。我希望它忽略 rm-not-found-errors。我怎样才能强制？

生成文件

all:
        make clean
        make .lambda
        make .lambda_t
        make .activity
        make .activity_t_lambda
clean:
        rm .lambda .lambda_t .activity .activity_t_lambda

.lambda:
        awk '{printf "%.4f \n", log(2)/log(2.71828183)/$$1}' t_year > .lambda

.lambda_t:
        paste .lambda t_year > .lambda_t

.activity:
        awk '{printf "%.4f \n", $$1*2.71828183^(-$$1*$$2)}' .lambda_t > .activity

.activity_t_lambda:
        paste .activity t_year .lambda  | sed -e 's@\t@\t\&\t@g' -e 's@$$@\t\\\\@g' | tee > .activity_t_lambda > ../RESULTS/currentActivity.tex