linux – 如果补丁跳过补丁,如何不破坏makefile？

我想在makefile中应用补丁.如果尚未应用补丁,则此工作正常.但是,如果我尝试在原始文件已经修补之后进行修改,则会导致makefile在完成之前退出.

Makefile –

all:
        echo "starting patch"
        patch -N < patchfiles/foo.patch
        echo "patched"

在文件已经修补后尝试运行后的结果 –

usr-mbp:makefile usr$make
echo "starting patch"
starting patch
patch -N < patchfiles/foo.patch
patching file foo
Reversed (or previously applied) patch detected!  Skipping patch.
1 out of 1 hunk ignored -- saving rejects to file foo.rej
make: *** [all] Error 1

我认为使用-N选项只会跳过补丁而不会导致任何错误.显然我错了.有关如何修复makefile的任何想法,以便它不会将跳过的补丁解释为错误？

谢谢！

编辑：

如果我想在补丁之前cd到目录,那么使用-patch不起作用.这是结果：

Makefile文件：

all:
        echo "starting..."
        cd tmp && 
                -patch -N < ../patchfiles/Makefile.linux-p3041-3_0.patch
        echo "finished."

结果：

usr-mbp:makefile usr$make
echo "starting..."
starting...
cd tmp && 
                -patch -N < ../patchfiles/Makefile.linux-p3041-3_0.patch
/bin/sh: line 1: -patch: command not found
make: *** [all] Error 127