Should fix issues 17 and 18 (although I couldn't reproduce them).

source/dyaml/emitter.d

@@ -35,6 +35,7 @@ import dyaml.linebreak;
 import dyaml.queue;
 import dyaml.style;
 import dyaml.tag;
+import dyaml.tagdirective;
 
 
 package:

source/dyaml/queue.d

@@ -197,7 +197,7 @@ void free(T)(T* ptr) @system nothrow
     //GC doesn't need to care about any references in this struct anymore.
     static if(hasIndirections!T){GC.removeRange(cast(void*)ptr);}
     static if(hasMember!(T, "__dtor")){clear(*ptr);}
-    std.c.stdlib.free(ptr);
+    core.stdc.stdlib.free(ptr);
 }
 
 unittest