Fix libpath logic for Windows (#9712)

* Fix libpath logic for Windows (#9687)

* Use sys.base_prefix instead of sys.prefix (#9711)

* Use sys.base_prefix instead of sys.prefix

* Update libpath.py too

python-package/packager/nativelib.py

@@ -132,16 +132,28 @@ def locate_or_build_libxgboost(
 
     if build_config.use_system_libxgboost:
         # Find libxgboost from system prefix
-        sys_base_prefix = pathlib.Path(sys.base_prefix).absolute().resolve()
-        libxgboost_sys = sys_base_prefix / "lib" / _lib_name()
-        if not libxgboost_sys.exists():
-            raise RuntimeError(
-                f"use_system_libxgboost was specified but {_lib_name()} is "
-                f"not found in {libxgboost_sys.parent}"
-            )
-
-        logger.info("Using system XGBoost: %s", str(libxgboost_sys))
-        return libxgboost_sys
+        sys_prefix = pathlib.Path(sys.base_prefix)
+        sys_prefix_candidates = [
+            sys_prefix / "lib",
+            # Paths possibly used on Windows
+            sys_prefix / "bin",
+            sys_prefix / "Library",
+            sys_prefix / "Library" / "bin",
+            sys_prefix / "Library" / "lib",
+        ]
+        sys_prefix_candidates = [
+            p.expanduser().resolve() for p in sys_prefix_candidates
+        ]
+        for candidate_dir in sys_prefix_candidates:
+            libtreelite_sys = candidate_dir / _lib_name()
+            if libtreelite_sys.exists():
+                logger.info("Using system XGBoost: %s", str(libtreelite_sys))
+                return libtreelite_sys
+        raise RuntimeError(
+            f"use_system_libxgboost was specified but {_lib_name()} is "
+            f"not found. Paths searched (in order): \n"
+            + "\n".join([f"* {str(p)}" for p in sys_prefix_candidates])
+        )
 
     libxgboost = locate_local_libxgboost(toplevel_dir, logger=logger)
     if libxgboost is not None: