unrecognized command line option '-Wl'

[qas612820704]

$ gcc --version
gcc (Debian 4.9.1-19) 4.9.1
...

How do I fix it when I make it?

[mildsunrise]

Sundown was deprecated / frozen a while ago, you should use a fork like Hoedown instead.

[zoobab]

Even though Sundown might be deprecated, that it is not a satisfactory answer to the question on why it does not compile with GCC 4.9.

[Nikaoto]

Put a comma after it in the Makefile:

@@ -44,7 +44,7 @@ libsundown.so:	libsundown.so.1
 	ln -f -s $^ $@
 
 libsundown.so.1: $(SUNDOWN_SRC)
-	$(CC) $(LDFLAGS) -shared -Wl $^ -o $@
+	$(CC) $(LDFLAGS) -shared -Wl,$^ -o $@
 
 # executables