multi-pack-index: provide more helpful usage info

diff --git a/pack-bitmap.h b/pack-bitmap.h
index 4555907dee99fbf731b739c584837adbbe8270f1..8a04741e1253b0ba801445a76ceb8e4937121f73 100644 (file)
--- a/pack-bitmap.h
+++ b/pack-bitmap.h
@@ -5,6 +5,9 @@
 #include "khash.h"
 #include "pack-objects.h"
 
+struct commit;
+struct rev_info;
+
 struct bitmap_disk_header {
        char magic[4];
        uint16_t version;