Add missing includes and forward declarations

diff --git a/diffcore.h b/diffcore.h
index a30da161dafcf0d3951e3208000c54388803c8f0..0dd1e9a63a05de7774ebdea4f2236ce584c32d0c 100644 (file)
--- a/diffcore.h
+++ b/diffcore.h
@@ -4,6 +4,10 @@
 #ifndef DIFFCORE_H
 #define DIFFCORE_H
 
+#include "cache.h"
+
+struct diff_options;
+
 /* This header file is internal between diff.c and its diff transformers
  * (e.g. diffcore-rename, diffcore-pickaxe).  Never include this header
  * in anything else.