-- The Python bindings bundle a separate cmake build of the C++ library,
-- which fails against abseil 20250127+. Prefer the system sentencepiece
-- shared libraries when they are available, and accept .so as well as .a.
-- Also fix the pyproject.toml license field for current setuptools.

--- setup.py.orig	2026-07-01 09:52:43 UTC
+++ setup.py
@@ -74,15 +74,20 @@
       '-I' + os.path.normpath(os.path.join(root, 'include')),
   ] + get_protobuf_includes()
   libs = []
-  if os.path.exists(os.path.join(root, 'lib/libsentencepiece.a')):
+  libdir = None
+  suffix = None
+  for d in ['lib', 'lib64']:
+    for ext in ['.so', '.a']:
+      if os.path.exists(os.path.join(root, d, 'libsentencepiece' + ext)):
+        libdir = d
+        suffix = ext
+        break
+    if libdir:
+      break
+  if libdir:
     libs = [
-        os.path.join(root, 'lib/libsentencepiece.a'),
-        os.path.join(root, 'lib/libsentencepiece_train.a'),
-    ]
-  elif os.path.exists(os.path.join(root, 'lib64/libsentencepiece.a')):
-    libs = [
-        os.path.join(root, 'lib64/libsentencepiece.a'),
-        os.path.join(root, 'lib64/libsentencepiece_train.a'),
+        os.path.join(root, libdir, 'libsentencepiece' + suffix),
+        os.path.join(root, libdir, 'libsentencepiece_train' + suffix),
     ]
   return cflags, libs

@@ -104,16 +109,24 @@
   """Override build_extension to run cmake."""

   def build_extension(self, ext):
-    cflags, libs = get_cflags_and_libs('../build/root')
-    abseil_libs = find_abseil_lib('../build/third_party')
-    cflags.extend(find_absl_include(is_msvc=False))
+    cflags, libs = get_cflags_and_libs('/usr/local')
+    use_system = len(libs) > 0
+    abseil_libs = []

+    if not use_system:
+      cflags, libs = get_cflags_and_libs('../build/root')
+      abseil_libs = find_abseil_lib('../build/third_party')
+      cflags.extend(find_absl_include(is_msvc=False))
+
     if len(libs) == 0:
       subprocess.check_call(['./build_bundled.sh', __version__])
       cflags, libs = get_cflags_and_libs('./build/root')
       abseil_libs = find_abseil_lib('./build/third_party')
       cflags.extend(find_absl_include(is_msvc=False))

+    if use_system:
+      cflags = ['-std=c++17', '-I/usr/local/include']
+
     # Fix compile on some versions of Mac OSX
     # See: https://github.com/neulab/xnmt/issues/199
     if sys.platform == 'darwin':
--- pyproject.toml.orig	2026-07-01 09:52:43 UTC
+++ pyproject.toml
@@ -10,7 +10,7 @@
 ]
 description = "Unsupervised text tokenizer and detokenizer."
 readme = "README.md"
-license = "Apache-2.0"
+license = {text = "Apache-2.0"}
 requires-python = ">=3.9"
 urls = { "Homepage" = "https://github.com/google/sentencepiece" }
 classifiers = [