Update app.py

app.py

@@ -1,3 +1,4 @@
+import subprocess
 import sys
 from pathlib import Path
 
@@ -11,10 +12,15 @@ from TTS.api import TTS
 
 try:
     from TTS.tts.utils.monotonic_align import core as _monotonic_align_core  # noqa: F401
-except ImportError as exc:
-    raise RuntimeError(
-        "monotonic_align extension is missing. Run `pip install -e .` during build to compile XTTS dependencies."
-    ) from exc
+except ImportError:
+    build_cmd = [sys.executable, "setup.py", "build_ext", "--inplace"]
+    subprocess.run(build_cmd, cwd=APP_ROOT, check=True)
+    try:
+        from TTS.tts.utils.monotonic_align import core as _monotonic_align_core  # noqa: F401
+    except ImportError as exc:
+        raise RuntimeError(
+            "Failed to build monotonic_align extension; ensure build dependencies are installed."
+        ) from exc
 
 # Get device
 device = "cuda" if torch.cuda.is_available() else "cpu"