diff -pruN mozc.orig/build_mozc.py mozc/build_mozc.py
--- mozc.orig/build_mozc.py 2017-02-06 14:50:59.124605000 +0900
+++ mozc/build_mozc.py 2017-02-06 19:57:20.289605000 +0900
@@ -828,7 +828,7 @@ def BuildWithNinja(options, targets):
ninja = GetNinjaPath()
ninja_targets = [GetNinjaTargetName(target) for target in targets]
- RunOrDie([ninja, '-C', build_arg] + ninja_targets)
+ RunOrDie([ninja, '-v', '-C', build_arg] + ninja_targets)
def BuildOnWindows(targets):