我的Yocto项目版本
“3.1.15”
我在下面的目录下找到了nginx

meta-openembedded/meta-webserver/recipes-httpd/nginx
├── files
│   ├── 0001-Allow-the-overriding-of-the-endianness-via-the-confi.patch
│   ├── CVE-2021-23017.patch
│   ├── CVE-2021-3618.patch
│   ├── default_server.site
│   ├── nginx.conf
│   ├── nginx-cross.patch
│   ├── nginx-fix-pidfile.patch
│   ├── nginx.init
│   ├── nginx.service
│   ├── nginx-volatile.conf
│   └── proxy_params
├── nginx_1.16.1.bb
├── nginx_1.17.8.bb
└── nginx.inc

我试着加上

IMAGE_INSTALL += "nginx"

在build\conf\local.conf下，但显示错误

ERROR: Nothing RPROVIDES 'nginx' 
NOTE: Runtime target 'nginx' is unbuildable, removing...
Missing or unbuildable dependency chain was: ['nginx']
ERROR: Required build target 'rity-demo-image' has no buildable providers.
Missing or unbuildable dependency chain was: ['rity-demo-image', 'nginx']

我读过一篇文章如何在Yocto中启用ngx_stream_core_module
上面说

PD: It is a bad practice to modify the *.inc or the *.bb of a recipe from a third party layer, write a *.bbappend on your own layer instead.

为什么？如果我想正确安装nginx，我应该怎么做