diff --git a/.github/workflows/pip_install_gmpy2.yml b/.github/workflows/pip_install_gmpy2.yml
index 3c090b6c..e34bbc4c 100644
--- a/.github/workflows/pip_install_gmpy2.yml
+++ b/.github/workflows/pip_install_gmpy2.yml
@@ -19,7 +19,7 @@ jobs:
       - run: pip install --upgrade pip
       - run: pip --verbose install --editable .[tests]
       - run: pytest test/
-      - run: PYTHONPATH=`pwd`/gmpy2 python test_cython/runtests.py
+      - run: PYTHONPATH=`pwd`/src/gmpy2 python test_cython/runtests.py
         if: ${{ matrix.python-version != '3.13' }}
 
   linux:
@@ -45,7 +45,7 @@ jobs:
       - name: Tests
         run: |
           pytest test/
-          PYTHONPATH=`pwd`/gmpy2 python test_cython/runtests.py
+          PYTHONPATH=`pwd`/src/gmpy2 python test_cython/runtests.py
       - name: Building docs
         if: matrix.python-version == 3.11
         run: |
@@ -60,7 +60,7 @@ jobs:
           python setup.py clean
           CFLAGS="-coverage" python setup.py develop
           pytest test/
-          PYTHONPATH=`pwd`/gmpy2 python test_cython/runtests.py
+          PYTHONPATH=`pwd`/src/gmpy2 python test_cython/runtests.py
           lcov --capture --directory . --no-external --output-file build/coverage.info
           genhtml build/coverage.info --output-directory build/coverage
       - name: Upload coverage to Codecov
@@ -104,4 +104,4 @@ jobs:
       - run: pip install --upgrade pip
       - run: pip --verbose install -e .[tests]
       - run: pytest test/
-      - run: PYTHONPATH=`pwd`/gmpy2 python test_cython/runtests.py
+      - run: PYTHONPATH=`pwd`/src/gmpy2 python test_cython/runtests.py
diff --git a/gmpy2/__init__.pxd b/gmpy2/__init__.pxd
deleted file mode 100644
index 3fcc1186..00000000
--- a/gmpy2/__init__.pxd
+++ /dev/null
@@ -1 +0,0 @@
-from gmpy2.gmpy2 cimport *
diff --git a/gmpy2/__init__.py b/gmpy2/__init__.py
deleted file mode 100644
index e07a3b7c..00000000
--- a/gmpy2/__init__.py
+++ /dev/null
@@ -1,10 +0,0 @@
-from .gmpy2 import *
-from .gmpy2 import __version__
-# Internal variables/functions are not imported by * above.
-# These are used by some python level functions and are needed
-# at the top level.
-# Use try...except to for static builds were _C_API is not available.
-try:
-    from .gmpy2 import _C_API, _mpmath_normalize, _mpmath_create
-except ImportError:
-    from .gmpy2 import _mpmath_normalize, _mpmath_create
diff --git a/gmpy2/gmpy2.h b/gmpy2/gmpy2.h
deleted file mode 120000
index 99fa021f..00000000
--- a/gmpy2/gmpy2.h
+++ /dev/null
@@ -1 +0,0 @@
-../src/gmpy2.h
\ No newline at end of file
diff --git a/gmpy2/gmpy2.pxd b/gmpy2/gmpy2.pxd
deleted file mode 120000
index 34f928bc..00000000
--- a/gmpy2/gmpy2.pxd
+++ /dev/null
@@ -1 +0,0 @@
-../src/gmpy2.pxd
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index 2e74fd07..8de7a2f0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -45,13 +45,15 @@ Homepage = 'https://github.com/aleaxit/gmpy'
 
 [tool.setuptools]
 zip-safe = false
-include-package-data = true
 
-[tool.setuptools.packages]
-find = {namespaces = false}
+[tool.setuptools.packages.find]
+where = ['src']
 
 [tool.setuptools.package-data]
-gmpy2 = ['*.pxd', '*.h', '*.dll', '*.lib']
+gmpy2 = ['*.pxd', 'gmpy2.h', 'gmp.h', 'mpfr.h', 'mpc.h']
+
+[tool.setuptools.exclude-package-data]
+gmpy2 = ['gmpy2.c']
 
 [tool.pytest.ini_options]
 addopts = "--durations=10"
diff --git a/scripts/cibw_before_all.sh b/scripts/cibw_before_all.sh
index 90106caa..d67610be 100644
--- a/scripts/cibw_before_all.sh
+++ b/scripts/cibw_before_all.sh
@@ -54,7 +54,7 @@ make install
 cd ../
 
 # -- copy headers --
-cp $PREFIX/include/{gmp,mpfr,mpc}.h gmpy2/
+cp $PREFIX/include/{gmp,mpfr,mpc}.h src/gmpy2/
 
 # -- generate *.lib files from *.dll on M$ Windows --
 if [ "$OSTYPE" = "msys" ]
diff --git a/scripts/cibw_repair_wheel_command.sh b/scripts/cibw_repair_wheel_command.sh
index da659d2a..f123bbca 100644
--- a/scripts/cibw_repair_wheel_command.sh
+++ b/scripts/cibw_repair_wheel_command.sh
@@ -6,7 +6,8 @@ LD_LIBRARY_PATH="$(pwd)/.local/lib:$LD_LIBRARY_PATH"
 
 if [[ "$OSTYPE" == "darwin"* ]]
 then
-  delocate-wheel --lib-sdir ../gmpy2.libs -w ${DEST_DIR} -v ${WHEEL}
+  pip install -U git+https://github.com/skirpichev/delocate.git@fix-lib-sdir
+  delocate-wheel --lib-sdir .libs -w ${DEST_DIR} -v ${WHEEL}
 else
   auditwheel repair -w ${DEST_DIR} ${WHEEL}
 fi
diff --git a/scripts/cibw_repair_wheel_command_windows.sh b/scripts/cibw_repair_wheel_command_windows.sh
index 3105800d..43f6cfe1 100644
--- a/scripts/cibw_repair_wheel_command_windows.sh
+++ b/scripts/cibw_repair_wheel_command_windows.sh
@@ -5,7 +5,8 @@ set -e -x
 wheel=$WHEELNAME
 dest_dir=$WHEELHOUSE
 
+# XXX: this dumps *.dll and *.lib to the site-packages/
 delvewheel repair ${wheel} -w ${dest_dir} --add-path .local/bin --no-mangle-all
 
 cp .local/bin/{gmp,mpfr,mpc}.lib ${dest_dir}
-(cd ${dest_dir}; wheel unpack --dest . gmpy2-*.whl; mv *.lib gmpy2-*/gmpy2.libs; wheel pack gmpy2-*[0-9]; rm -rf gmpy2-*[0-9])
+(cd ${dest_dir}; wheel unpack --dest . gmpy2-*.whl; mv *.lib gmpy2-*/*/platlib/; wheel pack gmpy2-*[0-9]; rm -rf gmpy2-*[0-9])
diff --git a/setup.py b/setup.py
index fac0c365..2d232c54 100644
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,7 @@
 
 ON_WINDOWS = platform.system() == 'Windows'
 _comp_args = ["DSHARED=1"]
-sources = ['src/gmpy2.c']
+sources = ['src/gmpy2/gmpy2.c']
 if os.getenv('CIBUILDWHEEL'):
     include_dirs = [os.path.join(os.path.dirname(__file__), '.local', 'include')]
     library_dirs = [os.path.join(os.path.dirname(__file__), '.local',
@@ -71,7 +71,7 @@ def build_extensions(self):
         build_ext.build_extensions(self)
 
 extensions = [
-    Extension('gmpy2.gmpy2',
+    Extension('gmpy2',
               sources=sources,
               include_dirs=include_dirs,
               libraries=['mpc','mpfr','gmp'],
diff --git a/src/gmpy2.c b/src/gmpy2/gmpy2.c
similarity index 100%
rename from src/gmpy2.c
rename to src/gmpy2/gmpy2.c
diff --git a/src/gmpy2.h b/src/gmpy2/gmpy2.h
similarity index 100%
rename from src/gmpy2.h
rename to src/gmpy2/gmpy2.h
diff --git a/src/gmpy2.pxd b/src/gmpy2/gmpy2.pxd
similarity index 100%
rename from src/gmpy2.pxd
rename to src/gmpy2/gmpy2.pxd
diff --git a/src/gmpy2_abs.c b/src/gmpy2/gmpy2_abs.c
similarity index 100%
rename from src/gmpy2_abs.c
rename to src/gmpy2/gmpy2_abs.c
diff --git a/src/gmpy2_abs.h b/src/gmpy2/gmpy2_abs.h
similarity index 100%
rename from src/gmpy2_abs.h
rename to src/gmpy2/gmpy2_abs.h
diff --git a/src/gmpy2_add.c b/src/gmpy2/gmpy2_add.c
similarity index 100%
rename from src/gmpy2_add.c
rename to src/gmpy2/gmpy2_add.c
diff --git a/src/gmpy2_add.h b/src/gmpy2/gmpy2_add.h
similarity index 100%
rename from src/gmpy2_add.h
rename to src/gmpy2/gmpy2_add.h
diff --git a/src/gmpy2_binary.c b/src/gmpy2/gmpy2_binary.c
similarity index 100%
rename from src/gmpy2_binary.c
rename to src/gmpy2/gmpy2_binary.c
diff --git a/src/gmpy2_binary.h b/src/gmpy2/gmpy2_binary.h
similarity index 100%
rename from src/gmpy2_binary.h
rename to src/gmpy2/gmpy2_binary.h
diff --git a/src/gmpy2_cache.c b/src/gmpy2/gmpy2_cache.c
similarity index 100%
rename from src/gmpy2_cache.c
rename to src/gmpy2/gmpy2_cache.c
diff --git a/src/gmpy2_cache.h b/src/gmpy2/gmpy2_cache.h
similarity index 100%
rename from src/gmpy2_cache.h
rename to src/gmpy2/gmpy2_cache.h
diff --git a/src/gmpy2_cmp.c b/src/gmpy2/gmpy2_cmp.c
similarity index 100%
rename from src/gmpy2_cmp.c
rename to src/gmpy2/gmpy2_cmp.c
diff --git a/src/gmpy2_cmp.h b/src/gmpy2/gmpy2_cmp.h
similarity index 100%
rename from src/gmpy2_cmp.h
rename to src/gmpy2/gmpy2_cmp.h
diff --git a/src/gmpy2_const.c b/src/gmpy2/gmpy2_const.c
similarity index 100%
rename from src/gmpy2_const.c
rename to src/gmpy2/gmpy2_const.c
diff --git a/src/gmpy2_const.h b/src/gmpy2/gmpy2_const.h
similarity index 100%
rename from src/gmpy2_const.h
rename to src/gmpy2/gmpy2_const.h
diff --git a/src/gmpy2_context.c b/src/gmpy2/gmpy2_context.c
similarity index 100%
rename from src/gmpy2_context.c
rename to src/gmpy2/gmpy2_context.c
diff --git a/src/gmpy2_context.h b/src/gmpy2/gmpy2_context.h
similarity index 100%
rename from src/gmpy2_context.h
rename to src/gmpy2/gmpy2_context.h
diff --git a/src/gmpy2_convert.c b/src/gmpy2/gmpy2_convert.c
similarity index 100%
rename from src/gmpy2_convert.c
rename to src/gmpy2/gmpy2_convert.c
diff --git a/src/gmpy2_convert.h b/src/gmpy2/gmpy2_convert.h
similarity index 100%
rename from src/gmpy2_convert.h
rename to src/gmpy2/gmpy2_convert.h
diff --git a/src/gmpy2_convert_gmp.c b/src/gmpy2/gmpy2_convert_gmp.c
similarity index 100%
rename from src/gmpy2_convert_gmp.c
rename to src/gmpy2/gmpy2_convert_gmp.c
diff --git a/src/gmpy2_convert_gmp.h b/src/gmpy2/gmpy2_convert_gmp.h
similarity index 100%
rename from src/gmpy2_convert_gmp.h
rename to src/gmpy2/gmpy2_convert_gmp.h
diff --git a/src/gmpy2_convert_mpc.c b/src/gmpy2/gmpy2_convert_mpc.c
similarity index 100%
rename from src/gmpy2_convert_mpc.c
rename to src/gmpy2/gmpy2_convert_mpc.c
diff --git a/src/gmpy2_convert_mpc.h b/src/gmpy2/gmpy2_convert_mpc.h
similarity index 100%
rename from src/gmpy2_convert_mpc.h
rename to src/gmpy2/gmpy2_convert_mpc.h
diff --git a/src/gmpy2_convert_mpfr.c b/src/gmpy2/gmpy2_convert_mpfr.c
similarity index 100%
rename from src/gmpy2_convert_mpfr.c
rename to src/gmpy2/gmpy2_convert_mpfr.c
diff --git a/src/gmpy2_convert_mpfr.h b/src/gmpy2/gmpy2_convert_mpfr.h
similarity index 100%
rename from src/gmpy2_convert_mpfr.h
rename to src/gmpy2/gmpy2_convert_mpfr.h
diff --git a/src/gmpy2_convert_utils.c b/src/gmpy2/gmpy2_convert_utils.c
similarity index 100%
rename from src/gmpy2_convert_utils.c
rename to src/gmpy2/gmpy2_convert_utils.c
diff --git a/src/gmpy2_convert_utils.h b/src/gmpy2/gmpy2_convert_utils.h
similarity index 100%
rename from src/gmpy2_convert_utils.h
rename to src/gmpy2/gmpy2_convert_utils.h
diff --git a/src/gmpy2_divmod.c b/src/gmpy2/gmpy2_divmod.c
similarity index 100%
rename from src/gmpy2_divmod.c
rename to src/gmpy2/gmpy2_divmod.c
diff --git a/src/gmpy2_divmod.h b/src/gmpy2/gmpy2_divmod.h
similarity index 100%
rename from src/gmpy2_divmod.h
rename to src/gmpy2/gmpy2_divmod.h
diff --git a/src/gmpy2_floordiv.c b/src/gmpy2/gmpy2_floordiv.c
similarity index 100%
rename from src/gmpy2_floordiv.c
rename to src/gmpy2/gmpy2_floordiv.c
diff --git a/src/gmpy2_floordiv.h b/src/gmpy2/gmpy2_floordiv.h
similarity index 100%
rename from src/gmpy2_floordiv.h
rename to src/gmpy2/gmpy2_floordiv.h
diff --git a/src/gmpy2_format.c b/src/gmpy2/gmpy2_format.c
similarity index 100%
rename from src/gmpy2_format.c
rename to src/gmpy2/gmpy2_format.c
diff --git a/src/gmpy2_format.h b/src/gmpy2/gmpy2_format.h
similarity index 100%
rename from src/gmpy2_format.h
rename to src/gmpy2/gmpy2_format.h
diff --git a/src/gmpy2_fused.c b/src/gmpy2/gmpy2_fused.c
similarity index 100%
rename from src/gmpy2_fused.c
rename to src/gmpy2/gmpy2_fused.c
diff --git a/src/gmpy2_fused.h b/src/gmpy2/gmpy2_fused.h
similarity index 100%
rename from src/gmpy2_fused.h
rename to src/gmpy2/gmpy2_fused.h
diff --git a/src/gmpy2_hash.c b/src/gmpy2/gmpy2_hash.c
similarity index 100%
rename from src/gmpy2_hash.c
rename to src/gmpy2/gmpy2_hash.c
diff --git a/src/gmpy2_hash.h b/src/gmpy2/gmpy2_hash.h
similarity index 100%
rename from src/gmpy2_hash.h
rename to src/gmpy2/gmpy2_hash.h
diff --git a/src/gmpy2_macros.h b/src/gmpy2/gmpy2_macros.h
similarity index 100%
rename from src/gmpy2_macros.h
rename to src/gmpy2/gmpy2_macros.h
diff --git a/src/gmpy2_math.c b/src/gmpy2/gmpy2_math.c
similarity index 100%
rename from src/gmpy2_math.c
rename to src/gmpy2/gmpy2_math.c
diff --git a/src/gmpy2_math.h b/src/gmpy2/gmpy2_math.h
similarity index 100%
rename from src/gmpy2_math.h
rename to src/gmpy2/gmpy2_math.h
diff --git a/src/gmpy2_minus.c b/src/gmpy2/gmpy2_minus.c
similarity index 100%
rename from src/gmpy2_minus.c
rename to src/gmpy2/gmpy2_minus.c
diff --git a/src/gmpy2_minus.h b/src/gmpy2/gmpy2_minus.h
similarity index 100%
rename from src/gmpy2_minus.h
rename to src/gmpy2/gmpy2_minus.h
diff --git a/src/gmpy2_misc.c b/src/gmpy2/gmpy2_misc.c
similarity index 100%
rename from src/gmpy2_misc.c
rename to src/gmpy2/gmpy2_misc.c
diff --git a/src/gmpy2_misc.h b/src/gmpy2/gmpy2_misc.h
similarity index 100%
rename from src/gmpy2_misc.h
rename to src/gmpy2/gmpy2_misc.h
diff --git a/src/gmpy2_mod.c b/src/gmpy2/gmpy2_mod.c
similarity index 100%
rename from src/gmpy2_mod.c
rename to src/gmpy2/gmpy2_mod.c
diff --git a/src/gmpy2_mod.h b/src/gmpy2/gmpy2_mod.h
similarity index 100%
rename from src/gmpy2_mod.h
rename to src/gmpy2/gmpy2_mod.h
diff --git a/src/gmpy2_mpc.c b/src/gmpy2/gmpy2_mpc.c
similarity index 100%
rename from src/gmpy2_mpc.c
rename to src/gmpy2/gmpy2_mpc.c
diff --git a/src/gmpy2_mpc.h b/src/gmpy2/gmpy2_mpc.h
similarity index 100%
rename from src/gmpy2_mpc.h
rename to src/gmpy2/gmpy2_mpc.h
diff --git a/src/gmpy2_mpc_misc.c b/src/gmpy2/gmpy2_mpc_misc.c
similarity index 100%
rename from src/gmpy2_mpc_misc.c
rename to src/gmpy2/gmpy2_mpc_misc.c
diff --git a/src/gmpy2_mpc_misc.h b/src/gmpy2/gmpy2_mpc_misc.h
similarity index 100%
rename from src/gmpy2_mpc_misc.h
rename to src/gmpy2/gmpy2_mpc_misc.h
diff --git a/src/gmpy2_mpfr.c b/src/gmpy2/gmpy2_mpfr.c
similarity index 100%
rename from src/gmpy2_mpfr.c
rename to src/gmpy2/gmpy2_mpfr.c
diff --git a/src/gmpy2_mpfr.h b/src/gmpy2/gmpy2_mpfr.h
similarity index 100%
rename from src/gmpy2_mpfr.h
rename to src/gmpy2/gmpy2_mpfr.h
diff --git a/src/gmpy2_mpfr_misc.c b/src/gmpy2/gmpy2_mpfr_misc.c
similarity index 100%
rename from src/gmpy2_mpfr_misc.c
rename to src/gmpy2/gmpy2_mpfr_misc.c
diff --git a/src/gmpy2_mpfr_misc.h b/src/gmpy2/gmpy2_mpfr_misc.h
similarity index 100%
rename from src/gmpy2_mpfr_misc.h
rename to src/gmpy2/gmpy2_mpfr_misc.h
diff --git a/src/gmpy2_mpmath.c b/src/gmpy2/gmpy2_mpmath.c
similarity index 100%
rename from src/gmpy2_mpmath.c
rename to src/gmpy2/gmpy2_mpmath.c
diff --git a/src/gmpy2_mpq.c b/src/gmpy2/gmpy2_mpq.c
similarity index 100%
rename from src/gmpy2_mpq.c
rename to src/gmpy2/gmpy2_mpq.c
diff --git a/src/gmpy2_mpq.h b/src/gmpy2/gmpy2_mpq.h
similarity index 100%
rename from src/gmpy2_mpq.h
rename to src/gmpy2/gmpy2_mpq.h
diff --git a/src/gmpy2_mpq_misc.c b/src/gmpy2/gmpy2_mpq_misc.c
similarity index 100%
rename from src/gmpy2_mpq_misc.c
rename to src/gmpy2/gmpy2_mpq_misc.c
diff --git a/src/gmpy2_mpq_misc.h b/src/gmpy2/gmpy2_mpq_misc.h
similarity index 100%
rename from src/gmpy2_mpq_misc.h
rename to src/gmpy2/gmpy2_mpq_misc.h
diff --git a/src/gmpy2_mpz.c b/src/gmpy2/gmpy2_mpz.c
similarity index 100%
rename from src/gmpy2_mpz.c
rename to src/gmpy2/gmpy2_mpz.c
diff --git a/src/gmpy2_mpz.h b/src/gmpy2/gmpy2_mpz.h
similarity index 100%
rename from src/gmpy2_mpz.h
rename to src/gmpy2/gmpy2_mpz.h
diff --git a/src/gmpy2_mpz_bitops.c b/src/gmpy2/gmpy2_mpz_bitops.c
similarity index 100%
rename from src/gmpy2_mpz_bitops.c
rename to src/gmpy2/gmpy2_mpz_bitops.c
diff --git a/src/gmpy2_mpz_bitops.h b/src/gmpy2/gmpy2_mpz_bitops.h
similarity index 100%
rename from src/gmpy2_mpz_bitops.h
rename to src/gmpy2/gmpy2_mpz_bitops.h
diff --git a/src/gmpy2_mpz_divmod.c b/src/gmpy2/gmpy2_mpz_divmod.c
similarity index 100%
rename from src/gmpy2_mpz_divmod.c
rename to src/gmpy2/gmpy2_mpz_divmod.c
diff --git a/src/gmpy2_mpz_divmod.h b/src/gmpy2/gmpy2_mpz_divmod.h
similarity index 100%
rename from src/gmpy2_mpz_divmod.h
rename to src/gmpy2/gmpy2_mpz_divmod.h
diff --git a/src/gmpy2_mpz_divmod2exp.c b/src/gmpy2/gmpy2_mpz_divmod2exp.c
similarity index 100%
rename from src/gmpy2_mpz_divmod2exp.c
rename to src/gmpy2/gmpy2_mpz_divmod2exp.c
diff --git a/src/gmpy2_mpz_divmod2exp.h b/src/gmpy2/gmpy2_mpz_divmod2exp.h
similarity index 100%
rename from src/gmpy2_mpz_divmod2exp.h
rename to src/gmpy2/gmpy2_mpz_divmod2exp.h
diff --git a/src/gmpy2_mpz_misc.c b/src/gmpy2/gmpy2_mpz_misc.c
similarity index 100%
rename from src/gmpy2_mpz_misc.c
rename to src/gmpy2/gmpy2_mpz_misc.c
diff --git a/src/gmpy2_mpz_misc.h b/src/gmpy2/gmpy2_mpz_misc.h
similarity index 100%
rename from src/gmpy2_mpz_misc.h
rename to src/gmpy2/gmpy2_mpz_misc.h
diff --git a/src/gmpy2_mpz_pack.c b/src/gmpy2/gmpy2_mpz_pack.c
similarity index 100%
rename from src/gmpy2_mpz_pack.c
rename to src/gmpy2/gmpy2_mpz_pack.c
diff --git a/src/gmpy2_mpz_pack.h b/src/gmpy2/gmpy2_mpz_pack.h
similarity index 100%
rename from src/gmpy2_mpz_pack.h
rename to src/gmpy2/gmpy2_mpz_pack.h
diff --git a/src/gmpy2_mul.c b/src/gmpy2/gmpy2_mul.c
similarity index 100%
rename from src/gmpy2_mul.c
rename to src/gmpy2/gmpy2_mul.c
diff --git a/src/gmpy2_mul.h b/src/gmpy2/gmpy2_mul.h
similarity index 100%
rename from src/gmpy2_mul.h
rename to src/gmpy2/gmpy2_mul.h
diff --git a/src/gmpy2_muldiv_2exp.c b/src/gmpy2/gmpy2_muldiv_2exp.c
similarity index 100%
rename from src/gmpy2_muldiv_2exp.c
rename to src/gmpy2/gmpy2_muldiv_2exp.c
diff --git a/src/gmpy2_muldiv_2exp.h b/src/gmpy2/gmpy2_muldiv_2exp.h
similarity index 100%
rename from src/gmpy2_muldiv_2exp.h
rename to src/gmpy2/gmpy2_muldiv_2exp.h
diff --git a/src/gmpy2_plus.c b/src/gmpy2/gmpy2_plus.c
similarity index 100%
rename from src/gmpy2_plus.c
rename to src/gmpy2/gmpy2_plus.c
diff --git a/src/gmpy2_plus.h b/src/gmpy2/gmpy2_plus.h
similarity index 100%
rename from src/gmpy2_plus.h
rename to src/gmpy2/gmpy2_plus.h
diff --git a/src/gmpy2_pow.c b/src/gmpy2/gmpy2_pow.c
similarity index 100%
rename from src/gmpy2_pow.c
rename to src/gmpy2/gmpy2_pow.c
diff --git a/src/gmpy2_pow.h b/src/gmpy2/gmpy2_pow.h
similarity index 100%
rename from src/gmpy2_pow.h
rename to src/gmpy2/gmpy2_pow.h
diff --git a/src/gmpy2_predicate.c b/src/gmpy2/gmpy2_predicate.c
similarity index 100%
rename from src/gmpy2_predicate.c
rename to src/gmpy2/gmpy2_predicate.c
diff --git a/src/gmpy2_predicate.h b/src/gmpy2/gmpy2_predicate.h
similarity index 100%
rename from src/gmpy2_predicate.h
rename to src/gmpy2/gmpy2_predicate.h
diff --git a/src/gmpy2_random.c b/src/gmpy2/gmpy2_random.c
similarity index 100%
rename from src/gmpy2_random.c
rename to src/gmpy2/gmpy2_random.c
diff --git a/src/gmpy2_random.h b/src/gmpy2/gmpy2_random.h
similarity index 100%
rename from src/gmpy2_random.h
rename to src/gmpy2/gmpy2_random.h
diff --git a/src/gmpy2_richcompare.c b/src/gmpy2/gmpy2_richcompare.c
similarity index 100%
rename from src/gmpy2_richcompare.c
rename to src/gmpy2/gmpy2_richcompare.c
diff --git a/src/gmpy2_richcompare.h b/src/gmpy2/gmpy2_richcompare.h
similarity index 100%
rename from src/gmpy2_richcompare.h
rename to src/gmpy2/gmpy2_richcompare.h
diff --git a/src/gmpy2_sign.c b/src/gmpy2/gmpy2_sign.c
similarity index 100%
rename from src/gmpy2_sign.c
rename to src/gmpy2/gmpy2_sign.c
diff --git a/src/gmpy2_sign.h b/src/gmpy2/gmpy2_sign.h
similarity index 100%
rename from src/gmpy2_sign.h
rename to src/gmpy2/gmpy2_sign.h
diff --git a/src/gmpy2_square.c b/src/gmpy2/gmpy2_square.c
similarity index 100%
rename from src/gmpy2_square.c
rename to src/gmpy2/gmpy2_square.c
diff --git a/src/gmpy2_square.h b/src/gmpy2/gmpy2_square.h
similarity index 100%
rename from src/gmpy2_square.h
rename to src/gmpy2/gmpy2_square.h
diff --git a/src/gmpy2_sub.c b/src/gmpy2/gmpy2_sub.c
similarity index 100%
rename from src/gmpy2_sub.c
rename to src/gmpy2/gmpy2_sub.c
diff --git a/src/gmpy2_sub.h b/src/gmpy2/gmpy2_sub.h
similarity index 100%
rename from src/gmpy2_sub.h
rename to src/gmpy2/gmpy2_sub.h
diff --git a/src/gmpy2_truediv.c b/src/gmpy2/gmpy2_truediv.c
similarity index 100%
rename from src/gmpy2_truediv.c
rename to src/gmpy2/gmpy2_truediv.c
diff --git a/src/gmpy2_truediv.h b/src/gmpy2/gmpy2_truediv.h
similarity index 100%
rename from src/gmpy2_truediv.h
rename to src/gmpy2/gmpy2_truediv.h
diff --git a/src/gmpy2_types.h b/src/gmpy2/gmpy2_types.h
similarity index 100%
rename from src/gmpy2_types.h
rename to src/gmpy2/gmpy2_types.h
diff --git a/src/gmpy2_vector.c b/src/gmpy2/gmpy2_vector.c
similarity index 100%
rename from src/gmpy2_vector.c
rename to src/gmpy2/gmpy2_vector.c
diff --git a/src/gmpy2_vector.h b/src/gmpy2/gmpy2_vector.h
similarity index 100%
rename from src/gmpy2_vector.h
rename to src/gmpy2/gmpy2_vector.h
diff --git a/src/gmpy2_xmpz.c b/src/gmpy2/gmpy2_xmpz.c
similarity index 100%
rename from src/gmpy2_xmpz.c
rename to src/gmpy2/gmpy2_xmpz.c
diff --git a/src/gmpy2_xmpz.h b/src/gmpy2/gmpy2_xmpz.h
similarity index 100%
rename from src/gmpy2_xmpz.h
rename to src/gmpy2/gmpy2_xmpz.h
diff --git a/src/gmpy2_xmpz_inplace.c b/src/gmpy2/gmpy2_xmpz_inplace.c
similarity index 100%
rename from src/gmpy2_xmpz_inplace.c
rename to src/gmpy2/gmpy2_xmpz_inplace.c
diff --git a/src/gmpy2_xmpz_inplace.h b/src/gmpy2/gmpy2_xmpz_inplace.h
similarity index 100%
rename from src/gmpy2_xmpz_inplace.h
rename to src/gmpy2/gmpy2_xmpz_inplace.h
diff --git a/src/gmpy2_xmpz_limbs.c b/src/gmpy2/gmpy2_xmpz_limbs.c
similarity index 100%
rename from src/gmpy2_xmpz_limbs.c
rename to src/gmpy2/gmpy2_xmpz_limbs.c
diff --git a/src/gmpy2_xmpz_limbs.h b/src/gmpy2/gmpy2_xmpz_limbs.h
similarity index 100%
rename from src/gmpy2_xmpz_limbs.h
rename to src/gmpy2/gmpy2_xmpz_limbs.h
diff --git a/src/gmpy2_xmpz_misc.c b/src/gmpy2/gmpy2_xmpz_misc.c
similarity index 100%
rename from src/gmpy2_xmpz_misc.c
rename to src/gmpy2/gmpy2_xmpz_misc.c
diff --git a/src/gmpy2_xmpz_misc.h b/src/gmpy2/gmpy2_xmpz_misc.h
similarity index 100%
rename from src/gmpy2_xmpz_misc.h
rename to src/gmpy2/gmpy2_xmpz_misc.h
diff --git a/src/gmpy_mpz_lucas.c b/src/gmpy2/gmpy_mpz_lucas.c
similarity index 100%
rename from src/gmpy_mpz_lucas.c
rename to src/gmpy2/gmpy_mpz_lucas.c
diff --git a/src/gmpy_mpz_lucas.h b/src/gmpy2/gmpy_mpz_lucas.h
similarity index 100%
rename from src/gmpy_mpz_lucas.h
rename to src/gmpy2/gmpy_mpz_lucas.h
diff --git a/src/gmpy_mpz_prp.c b/src/gmpy2/gmpy_mpz_prp.c
similarity index 100%
rename from src/gmpy_mpz_prp.c
rename to src/gmpy2/gmpy_mpz_prp.c
diff --git a/src/gmpy_mpz_prp.h b/src/gmpy2/gmpy_mpz_prp.h
similarity index 100%
rename from src/gmpy_mpz_prp.h
rename to src/gmpy2/gmpy_mpz_prp.h
diff --git a/src/mpz_pylong.c b/src/gmpy2/mpz_pylong.c
similarity index 100%
rename from src/mpz_pylong.c
rename to src/gmpy2/mpz_pylong.c
diff --git a/src/posix64/jacobi_sum.h b/src/gmpy2/posix64/jacobi_sum.h
similarity index 100%
rename from src/posix64/jacobi_sum.h
rename to src/gmpy2/posix64/jacobi_sum.h
diff --git a/src/posix64/mpz_aprcl.c b/src/gmpy2/posix64/mpz_aprcl.c
similarity index 100%
rename from src/posix64/mpz_aprcl.c
rename to src/gmpy2/posix64/mpz_aprcl.c
diff --git a/src/posix64/mpz_aprcl.h b/src/gmpy2/posix64/mpz_aprcl.h
similarity index 100%
rename from src/posix64/mpz_aprcl.h
rename to src/gmpy2/posix64/mpz_aprcl.h
diff --git a/src/pythoncapi_compat.h b/src/gmpy2/pythoncapi_compat.h
similarity index 100%
rename from src/pythoncapi_compat.h
rename to src/gmpy2/pythoncapi_compat.h
diff --git a/test_cython/setup_cython.py b/test_cython/setup_cython.py
index 77e28853..c9ab3183 100644
--- a/test_cython/setup_cython.py
+++ b/test_cython/setup_cython.py
@@ -6,10 +6,11 @@
 import gmpy2
 
 gmpy2_packagedir = os.path.dirname(gmpy2.__file__)
-library_dirs = sys.path + [gmpy2_packagedir]
+include_dirs = sys.path + [os.path.join(gmpy2_packagedir, 'gmpy2')]
+library_dirs = include_dirs
 libnames = ['mpc','mpfr','gmp']
 
-bundled_libs = os.path.join(gmpy2_packagedir, '..', 'gmpy2.libs')
+bundled_libs = os.path.join(gmpy2_packagedir, 'gmpy2.libs')
 if os.path.isdir(bundled_libs):
     library_dirs += [bundled_libs]
     if platform.system() == 'Linux':
@@ -20,12 +21,12 @@
 
 extensions = [
     Extension("test_cython", ["test_cython.pyx"],
-              include_dirs=sys.path + [gmpy2_packagedir],
+              include_dirs=include_dirs,
               library_dirs=library_dirs,
               libraries=libnames)]
 
 setup(
     name="cython_gmpy_test",
-    ext_modules=cythonize(extensions, include_path=sys.path,
+    ext_modules=cythonize(extensions, include_path=include_dirs,
                           compiler_directives={'language_level' : "3"})
 )