checkout: require worktree unconditionally

diff --git a/merge.c b/merge.c
index 74ced7f70b5beec045c134b5719c926fc791f1e2..fcff632bd63a113ca78b0bd86da1e6af8bc6f7dc 100644 (file)
--- a/merge.c
+++ b/merge.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "lockfile.h"
 #include "commit.h"
 #include "run-command.h"
 #include "resolve-undo.h"