diff --git a/CMakeLists.txt b/CMakeLists.txt
index 487e3da..d378da6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -97,7 +97,12 @@ if(NOT DEFINED ONNXRUNTIME_DIR)
 endif()
 
 # ---- espeak-ng ---
+set (ESPEAK_NG_REPO $ENV{ESPEAK_NG_REPO})
+if(NOT DEFINED ESPEAK_NG_REPO)
+    set(ESPEAK_NG_REPO "https://github.com/rhasspy/espeak-ng")
+endif()
 
+set(ESPEAK_NG_DIR $ENV{ESPEAK_NG_DIR})
 if(NOT DEFINED ESPEAK_NG_DIR)
     set(ESPEAK_NG_DIR "${CMAKE_CURRENT_BINARY_DIR}/ei")
 
diff --git a/piper_phonemize/__init__.py b/piper_phonemize/__init__.py
index c6072ae..6068c28 100644
--- a/piper_phonemize/__init__.py
+++ b/piper_phonemize/__init__.py
@@ -1,3 +1,5 @@
+import os
+import sys
 from collections import Counter
 from enum import Enum
 from pathlib import Path
@@ -17,6 +19,8 @@
 _DIR = Path(__file__).parent
 _TASHKEEL_MODEL = _DIR / "libtashkeel_model.ort"
 
+espeak_data_path = sys.prefix / "share" / "espeak-ng-data"
+os.environ["ESPEAK_DATA_PATH"] = str(espeak_data_path)
 
 class TextCasing(str, Enum):
     """Casing applied to text for phonemize_codepoints"""
diff --git a/setup.py b/setup.py
index 5028e71..fbe7a75 100644
--- a/setup.py
+++ b/setup.py
@@ -1,47 +1,97 @@
 import platform
+import shutil
+import sys
+
 from pathlib import Path
 
 # Available at setup time due to pyproject.toml
 from pybind11.setup_helpers import Pybind11Extension, build_ext
+from setuptools.command.install import install
 from setuptools import setup
 
-_DIR = Path(__file__).parent
-_ESPEAK_DIR = _DIR / "install"
-
 __version__ = "1.2.0"
 
+_DIR = Path(__file__).parent
+
 # Platform-specific settings
 if platform.system() == "Windows":
-    _LIB_DIR = _DIR / "lib" / "Windows-AMD64"
-    _ONNXRUNTIME_DIR = _LIB_DIR / "onnxruntime"
-    libraries = ["espeak-ng", "onnxruntime"]
-    extra_compile_args = ["/MT"]  # Example for static linking the MSVC runtime
-    library_dirs = [str(_ESPEAK_DIR / "lib"), str(_ONNXRUNTIME_DIR / "lib")]
-    include_dirs = [str(_ESPEAK_DIR / "include"), str(_ONNXRUNTIME_DIR / "include")]
+    _ESPEAK_DIR = _DIR / "build" / "ei"
+    _LIB_DIR = _DIR / "lib"
+    _ONNXRUNTIME_DIR = _LIB_DIR / "onnxruntime-win-x64-1.14.1"
 else:
+    _ESPEAK_DIR = _DIR / "install"
     _LIB_DIR = _DIR / "lib" / f"Linux-{platform.machine()}"
     _ONNXRUNTIME_DIR = _LIB_DIR / "onnxruntime"
-    libraries = ["espeak-ng", "onnxruntime"]
-    extra_compile_args = []  # Linux/macOS might not need specific flags here
-    library_dirs = [str(_ESPEAK_DIR / "lib"), str(_ONNXRUNTIME_DIR / "lib")]
-    include_dirs = [str(_ESPEAK_DIR / "include"), str(_ONNXRUNTIME_DIR / "include")]
 
-ext_modules = [
-    Pybind11Extension(
-        "piper_phonemize_cpp",
-        [
-            "src/python.cpp",
-            "src/phonemize.cpp",
-            "src/phoneme_ids.cpp",
-            "src/tashkeel.cpp",
-        ],
-        define_macros=[("VERSION_INFO", __version__)],
-        include_dirs=include_dirs,
-        library_dirs=library_dirs,
-        libraries=libraries,
-        extra_compile_args=extra_compile_args,
-    ),
-]
+if platform.system() == "Windows":
+    ext_modules = [
+        Pybind11Extension(
+            "piper_phonemize_cpp",
+            [
+                "src/python.cpp",
+                "src/phonemize.cpp",
+                "src/phoneme_ids.cpp",
+                "src/tashkeel.cpp",
+            ],
+            define_macros=[("VERSION_INFO", __version__)],
+            include_dirs=[
+                str(_ESPEAK_DIR / "include/espeak-ng"),
+                str(_ONNXRUNTIME_DIR / "include"),
+            ],
+            library_dirs=[str(_ESPEAK_DIR / "bin"), str(_ONNXRUNTIME_DIR / "lib")],
+            libraries=["espeak-ng", "onnxruntime"],
+        ),
+    ]
+else:
+    ext_modules = [
+        Pybind11Extension(
+            "piper_phonemize_cpp",
+            [
+                "src/python.cpp",
+                "src/phonemize.cpp",
+                "src/phoneme_ids.cpp",
+                "src/tashkeel.cpp",
+            ],
+            define_macros=[("VERSION_INFO", __version__)],
+            include_dirs=[str(_ESPEAK_DIR / "include"), str(_ONNXRUNTIME_DIR / "include")],
+            library_dirs=[str(_ESPEAK_DIR / "lib"), str(_ONNXRUNTIME_DIR / "lib")],
+            libraries=["espeak-ng", "onnxruntime"],
+        ),
+    ]
+
+
+class CustomInstallCommand(install):
+    """Customized setuptools install command to copy espeak-ng-data."""
+
+    def run(self):
+        # Call superclass install command
+        super().run()
+
+        # Check if the operating system is Windows
+        if platform.system() != "Windows":
+            print("Skipping custom installation steps: not running on Windows")
+            return
+
+        # Define the source directory for espeak-ng-data
+        source_dir = Path(__file__).parent / "build" / "ei" / "share" / "espeak-ng-data"
+
+        # Define the target directory within the Python environment's site-packages
+        target_dir = Path(sys.prefix) / "share" / "espeak-ng-data"
+
+        # Check if source_dir exists to prevent copying errors
+        if source_dir.exists():
+            # Use shutil.copytree to copy the entire directory
+            if target_dir.exists():
+                shutil.rmtree(
+                    target_dir
+                )  # Remove target if it already exists to avoid conflicts
+            shutil.copytree(source_dir, target_dir)
+            print(f"Copied espeak-ng-data to {target_dir}")
+        else:
+            print(
+                f"Source directory {source_dir} does not exist. espeak-ng-data not copied."
+            )
+
 
 setup(
     name="piper_phonemize",
@@ -60,7 +110,7 @@
     },
     include_package_data=True,
     ext_modules=ext_modules,
-    cmdclass={"build_ext": build_ext},
+    cmdclass={"build_ext": build_ext, "install": CustomInstallCommand},
     zip_safe=False,
     python_requires=">=3.7",
 )