diff --git a/configure.py b/configure.py
index a005425..7a177d1 100755
--- a/configure.py
+++ b/configure.py
@@ -102,6 +102,12 @@ parser.add_argument(
     type=Path,
     help="path to sjiswrap.exe (optional)",
 )
+parser.add_argument(
+    "--ninja",
+    metavar="BINARY",
+    type=Path,
+    help="path to ninja binary (optional)"
+)
 parser.add_argument(
     "--verbose",
     action="store_true",
@@ -141,6 +147,7 @@ config.compilers_path = args.compilers
 config.generate_map = args.map
 config.non_matching = args.non_matching
 config.sjiswrap_path = args.sjiswrap
+config.ninja_path = args.ninja
 config.progress = args.progress
 if not is_windows():
     config.wrapper = args.wrapper
diff --git a/tools/project.py b/tools/project.py
index fa0d68f..c6207c9 100644
--- a/tools/project.py
+++ b/tools/project.py
@@ -151,6 +151,7 @@ class ProjectConfig:
         self.wrapper: Optional[Path] = None  # If None, download wibo on Linux
         self.sjiswrap_tag: Optional[str] = None  # Git tag
         self.sjiswrap_path: Optional[Path] = None  # If None, download
+        self.ninja_path: Optional[Path] = None  # If None, use system PATH
         self.objdiff_tag: Optional[str] = None  # Git tag
         self.objdiff_path: Optional[Path] = None  # If None, download
 
@@ -1452,9 +1453,14 @@ def generate_objdiff_config(
             existing_config = json.load(r)
             existing_units = {unit["name"]: unit for unit in existing_config["units"]}
 
+    if config.ninja_path:
+        ninja = str(config.ninja_path.absolute())
+    else:
+        ninja = "ninja"
+
     objdiff_config: Dict[str, Any] = {
         "min_version": "2.0.0-beta.5",
-        "custom_make": "ninja",
+        "custom_make": ninja,
         "build_target": False,
         "watch_patterns": [
             "*.c",