setup: teach discover_git_directory to respect the commondir

diff --git a/unpack-trees.c b/unpack-trees.c
index aa15111fefc8ca333edeeeb3ac77a8b946e4c6a5..e7b5a21ef78daf6aebe1bf4630e4baeb11ffea0f 100644 (file)
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -1,5 +1,6 @@
 #define NO_THE_INDEX_COMPATIBILITY_MACROS
 #include "cache.h"
+#include "config.h"
 #include "dir.h"
 #include "tree.h"
 #include "tree-walk.h"