--- eccodes-1.3.3.unchanged/setup.py	2021-06-17 12:30:24.000000000 +0200
+++ eccodes-1.3.3.p1/setup.py	2021-07-03 11:59:17.432761578 +0200
@@ -52,6 +52,8 @@ setuptools.setup(
     license="Apache License Version 2.0",
     url="https://github.com/ecmwf/eccodes-python",
     packages=setuptools.find_packages(),
+    setup_requires=["cffi"],
+    cffi_modules=["builder.py:ffibuilder"],
     include_package_data=True,
     install_requires=install_requires,
     tests_require=[