diff --git a/conda_build/build.py b/conda_build/build.py
index 184f3cf79e..3fa97fb0a3 100644
--- a/conda_build/build.py
+++ b/conda_build/build.py
@@ -1753,13 +1753,16 @@ def bundle_conda(
                     output["script"],
                     args[0],
                 )
-            if "system32" in args[0] and "bash" in args[0]:
-                print(
-                    "ERROR :: WSL bash.exe detected, this will not work (PRs welcome!). Please\n"
-                    "         use MSYS2 packages. Add `m2-base` and more (depending on what your"
-                    "         script needs) to `requirements/build` instead."
+            if (
+                # WSL bash is always the same path, it is an alias to the default
+                # distribution as configured by the user
+                on_win and Path("C:\\Windows\\System32\\bash.exe").samefile(args[0])
+            ):
+                raise CondaBuildUserError(
+                    "WSL bash.exe is not supported. Please use MSYS2 packages. Add "
+                    "`m2-base` and more (depending on what your script needs) to "
+                    "`requirements/build` instead."
                 )
-                sys.exit(1)
         else:
             args = interpreter.split(" ")
 
@@ -4072,11 +4075,11 @@ def handle_pypi_upload(wheels, config):
             try:
                 utils.check_call_env(args + [f])
             except:
-                utils.get_logger(__name__).warn(
+                utils.get_logger(__name__).warning(
                     "wheel upload failed - is twine installed?"
                     "  Is this package registered?"
                 )
-                utils.get_logger(__name__).warn(f"Wheel file left in {f}")
+                utils.get_logger(__name__).warning(f"Wheel file left in {f}")
 
     else:
         print(f"anaconda_upload is not set.  Not uploading wheels: {wheels}")
diff --git a/conda_build/inspect_pkg.py b/conda_build/inspect_pkg.py
index 43fc401551..5747f3a7b8 100644
--- a/conda_build/inspect_pkg.py
+++ b/conda_build/inspect_pkg.py
@@ -258,7 +258,7 @@ def inspect_linkages(
                 if relative:
                     precs = list(which_package(relative, prefix))
                     if len(precs) > 1:
-                        get_logger(__name__).warn(
+                        get_logger(__name__).warning(
                             "Warning: %s comes from multiple packages: %s",
                             path,
                             comma_join(map(str, precs)),
diff --git a/conda_build/metadata.py b/conda_build/metadata.py
index d41e81a6db..d3ee86f214 100644
--- a/conda_build/metadata.py
+++ b/conda_build/metadata.py
@@ -199,7 +199,7 @@ def get_selectors(config: Config) -> dict[str, bool]:
     if not np:
         np = defaults["numpy"]
         if config.verbose:
-            utils.get_logger(__name__).warn(
+            utils.get_logger(__name__).warning(
                 "No numpy version specified in conda_build_config.yaml.  "
                 "Falling back to default numpy value of {}".format(defaults["numpy"])
             )
@@ -995,7 +995,9 @@ def _toposort_outputs(output_tuples: list[OutputTuple]) -> list[OutputTuple]:
             non_conda_outputs.append(output_tuple)
         else:
             # TODO: is it even possible to get here? and if so should we silently ignore or error?
-            utils.get_logger(__name__).warn("Found an output without a name, skipping")
+            utils.get_logger(__name__).warning(
+                "Found an output without a name, skipping"
+            )
 
     # Iterate over conda packages, creating a mapping of package names to their
     # dependencies to be used in toposort
@@ -2326,7 +2328,7 @@ def extract_single_output_text(
             output = output_matches[output_index] if output_matches else ""
         except ValueError:
             if not self.path and self.meta.get("extra", {}).get("parent_recipe"):
-                utils.get_logger(__name__).warn(
+                utils.get_logger(__name__).warning(
                     f"Didn't match any output in raw metadata.  Target value was: {output_name}"
                 )
                 output = ""
diff --git a/conda_build/utils.py b/conda_build/utils.py
index 17d1c1f031..e5e8d9c8c2 100644
--- a/conda_build/utils.py
+++ b/conda_build/utils.py
@@ -1318,7 +1318,7 @@ def find_recipe(path: str) -> str:
 
     metas = [m for m in VALID_METAS if os.path.isfile(os.path.join(path, m))]
     if len(metas) == 1:
-        get_logger(__name__).warn(
+        get_logger(__name__).warning(
             "Multiple meta files found. "
             f"The {metas[0]} file in the base directory ({path}) "
             "will be used."
diff --git a/tests/test_build.py b/tests/test_build.py
index af5abb0f70..f1a9f11736 100644
--- a/tests/test_build.py
+++ b/tests/test_build.py
@@ -15,6 +15,7 @@
 from typing import TYPE_CHECKING
 
 import pytest
+from conda.common.compat import on_win
 
 from conda_build import api, build
 from conda_build.exceptions import CondaBuildUserError
@@ -22,6 +23,8 @@
 from .utils import get_noarch_python_meta, metadata_dir
 
 if TYPE_CHECKING:
+    from pytest_mock import MockerFixture
+
     from conda_build.metadata import MetaData
 
 
@@ -345,3 +348,24 @@ def test_copy_readme(testing_metadata: MetaData, readme: str):
     Path(testing_metadata.config.work_dir, readme).touch()
     build.copy_readme(testing_metadata)
     assert Path(testing_metadata.config.info_dir, readme).exists()
+
+
+@pytest.mark.skipif(not on_win, reason="WSL is only on Windows")
+def test_wsl_unsupported(
+    testing_metadata: MetaData,
+    mocker: MockerFixture,
+    tmp_path: Path,
+):
+    mocker.patch(
+        "conda_build.os_utils.external.find_executable",
+        return_value="C:\\Windows\\System32\\bash.exe",
+    )
+
+    (script := tmp_path / "install.sh").touch()
+    with pytest.raises(CondaBuildUserError):
+        build.bundle_conda(
+            output={"script": script},
+            metadata=testing_metadata,
+            env={},
+            stats={},
+        )