In README.md, document how to add -lrt to make (for older distributions).

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@ -58,12 +58,19 @@ Run `make` and then `make install` as root.
If you're compiling on NetBSD, you should use the specific provided Makefile and run `make -f Makefile.NetBSD` and then `make -f Makefile.NetBSD install` as root.
From version 2.27, `snac` includes support for the Mastodon API; if you are not interested on it, you can compile it out by running
```sh
make CFLAGS=-DNO_MASTODON_API
```
If your compilation process complains about undefined references of `shm_open()` and `shm_unlink()` (it happens, for example, on 20.04.6 LTS), you need to tell `make` to add the `rt` library to the final linking command as follows:
```sh
make LDFLAGS=-lrt
```
See the administrator manual on how to proceed from here.
## Testing via Docker