Temporary OSX/Clang/C++11 workaround

- Adds a directive that includes <vector> upon specific conditions
- WIP

libs/pbd/pbd/stl_delete.h

@@ -20,6 +20,14 @@
 #ifndef __libmisc_stl_delete_h__
 #define __libmisc_stl_delete_h__
 
+
+#if __clang__ && __APPLE__ && __cplusplus >= 201103L
+#include <vector>
+#ifndef _CPP_VECTOR
+#define _CPP_VECTOR
+#endif
+#endif
+
 /* To actually use any of these deletion functions, you need to
    first include the revelant container type header.
 */