diff -up imagecodecs-2024.1.1/imagecodecs/imagecodecs.py.nobcn imagecodecs-2024.1.1/imagecodecs/imagecodecs.py
--- imagecodecs-2024.1.1/imagecodecs/imagecodecs.py.nobcn	2023-12-28 21:05:16.000000000 -0700
+++ imagecodecs-2024.1.1/imagecodecs/imagecodecs.py	2024-02-12 21:32:54.460164389 -0700
@@ -710,20 +710,6 @@ _MODULES: dict[str, list[str]] = {
         'cms_check',
         'cms_version',
     ],
-    '_bcn': [
-        'BCN',
-        'BcnError',
-        'bcn_encode',
-        'bcn_decode',
-        'bcn_check',
-        'bcn_version',
-        'DDS',
-        'DdsError',
-        'dds_encode',
-        'dds_decode',
-        'dds_check',
-        'dds_version',
-    ],
     '_deflate': [
         'DEFLATE',
         'DeflateError',
diff -up imagecodecs-2024.1.1/setup.py.nobcn imagecodecs-2024.1.1/setup.py
diff -up imagecodecs-2024.1.1/imagecodecs/__init__.pyi.nobcn imagecodecs-2024.1.1/imagecodecs/__init__.pyi
--- imagecodecs-2024.1.1/imagecodecs/__init__.pyi.nobcn	2023-12-28 13:34:01.000000000 -0700
+++ imagecodecs-2024.1.1/imagecodecs/__init__.pyi	2024-02-12 21:35:34.919824196 -0700
@@ -378,57 +378,6 @@ def avif_decode(
     """Return decoded AVIF image."""
 
 
-class BCN:
-    """BCn codec constants."""
-
-    available: bool
-    """BCn codec is available."""
-
-    class FORMAT(enum.IntEnum):
-        """BCn compression format."""
-
-        BC1 = 1  # DXT1
-        BC2 = 2  # DXT3
-        BC3 = 3  # DXT5
-        BC4 = 4  # BC4_UNORM
-        BC5 = 5  # BC5_UNORM
-        BC6HU = 6  # BC6H_UF16
-        BC6HS = -6  # BC6H_SF16
-        BC7 = 7  # BC7_UNORM
-
-
-class BcnError(RuntimeError):
-    """BCn codec exceptions."""
-
-
-def bcn_version() -> str:
-    """Return bcdec library version string."""
-
-
-def bcn_check(data: BytesLike, /) -> None:
-    """Return whether data is BCn encoded."""
-
-
-def bcn_encode(
-    data: BytesLike,
-    /,
-    *,
-    out: int | bytearray | None = None,
-) -> bytes | bytearray:
-    """Return BCn encoded data (not implemented)."""
-
-
-def bcn_decode(
-    data: BytesLike,
-    format: BCN.FORMAT | int,
-    /,
-    shape: tuple[int, ...] | None = None,
-    *,
-    out: int | bytearray | memoryview | None = None,
-) -> bytes | bytearray:
-    """Return decoded BCn data."""
-
-
 class BITORDER:
     """BITORDER codec constants."""
 
diff -up imagecodecs-2024.1.1/setup.py.nobcn imagecodecs-2024.1.1/setup.py
--- imagecodecs-2024.1.1/setup.py.nobcn	2023-12-28 15:06:07.000000000 -0700
+++ imagecodecs-2024.1.1/setup.py	2024-02-12 21:37:26.229282364 -0700
@@ -122,10 +122,6 @@ EXTENSIONS = {
     'aec': ext(libraries=['aec']),
     'apng': ext(libraries=['png']),
     'avif': ext(libraries=['avif']),
-    'bcn': ext(
-        include_dirs=['3rdparty/bcdec'],
-        define_macros=[('BCDEC_STATIC', 1), ('BCDEC_IMPLEMENTATION', 1)],
-    ),
     'bitshuffle': ext(
         sources=[
             '3rdparty/bitshuffle/bitshuffle_core.c',
diff -up imagecodecs-2024.1.1/setup.py.nobcn imagecodecs-2024.1.1/setup.py
--- imagecodecs-2024.1.1/setup.py.nobcn	2024-02-12 21:44:36.012054859 -0700
+++ imagecodecs-2024.1.1/setup.py	2024-02-12 21:45:05.113176289 -0700
@@ -586,6 +586,7 @@ if 'sdist' not in sys.argv:
         else:
             customize_build = customize_build_default
 
+    print(f'customize_build = {customize_build}')
     customize_build(EXTENSIONS, OPTIONS)
 
 
diff -up imagecodecs-2024.1.1/setup.py.nobcn imagecodecs-2024.1.1/setup.py
--- imagecodecs-2024.1.1/setup.py.nobcn	2024-02-12 21:46:16.313473389 -0700
+++ imagecodecs-2024.1.1/setup.py	2024-02-12 21:46:30.849534044 -0700
@@ -568,23 +568,9 @@ def customize_build_mingw(EXTENSIONS, OP
 
 if 'sdist' not in sys.argv:
     # customize builds based on environment
-    try:
-        from imagecodecs_distributor_setup import (  # type: ignore
-            customize_build,
-        )
-    except ImportError:
-        if os.environ.get('COMPUTERNAME', '').startswith('CG-'):
-            customize_build = customize_build_cgohlke
-        elif os.environ.get('IMAGECODECS_CIBW', ''):
-            customize_build = customize_build_cibuildwheel
-        elif os.environ.get('CONDA_BUILD', ''):
-            customize_build = customize_build_condaforge
-        elif shutil.which('port'):
-            customize_build = customize_build_macports
-        elif os.name == 'nt' and 'GCC' in sys.version:
-            customize_build = customize_build_mingw
-        else:
-            customize_build = customize_build_default
+    from imagecodecs_distributor_setup import (  # type: ignore
+        customize_build,
+    )
 
     print(f'customize_build = {customize_build}')
     customize_build(EXTENSIONS, OPTIONS)