Add missing includes and forward declarations

diff --git a/attr.h b/attr.h
index 442d464db6271da48a4ef133127c7d3a18c186cf..3185538bda31cadeefe2ffcd87a831148760843b 100644 (file)
--- a/attr.h
+++ b/attr.h
@@ -7,6 +7,7 @@ struct git_attr;
 /* opaque structures used internally for attribute collection */
 struct all_attrs_item;
 struct attr_stack;
+struct index_state;
 
 /*
  * Given a string, return the gitattribute object that