Rewritten a sentence to be clearer in README.md.

Makefile

@@ -6,7 +6,7 @@ all: snac
 
 snac: snac.o main.o data.o http.o httpd.o webfinger.o \
     activitypub.o html.o utils.o format.o upgrade.o mastoapi.o
-	$(CC) $(CFLAGS) -L/usr/local/lib *.o -lcurl -lcrypto -pthread $(LDFLAGS) -o $@
+	$(CC) $(CFLAGS) -L/usr/local/lib *.o -lcurl -lcrypto $(LDFLAGS) -pthread -o $@
 
 .c.o:
 	$(CC) $(CFLAGS) $(CPPFLAGS) -I/usr/local/include -c $<

README.md

@@ -65,7 +65,7 @@ From version 2.27, `snac` includes support for the Mastodon API; if you are not
 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:
+If your compilation process complains about undefined references to `shm_open()` and `shm_unlink()` (it happens, for example, on Ubuntu 20.04.6 LTS), run it as:
 
 ```sh
 make LDFLAGS=-lrt