config: don't implicitly use gitdir or commondir

diff --git a/builtin/diff-tree.c b/builtin/diff-tree.c
index 326f88b6576d6c02e9a0bcecb5a0b402bb257372..c81063d534f87a0d6d6ee768fab2253144674279 100644 (file)
--- a/builtin/diff-tree.c
+++ b/builtin/diff-tree.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "config.h"
 #include "diff.h"
 #include "commit.h"
 #include "log-tree.h"