diff -ur a/lib_pypy/pypy_tools/build_cffi_imports.py b/lib_pypy/pypy_tools/build_cffi_imports.py
--- a/lib_pypy/pypy_tools/build_cffi_imports.py	2021-04-12 01:11:48.000000000 -0400
+++ b/lib_pypy/pypy_tools/build_cffi_imports.py	2021-07-16 06:37:03.000000000 -0400
@@ -225,6 +225,8 @@
 
         print('*', ' '.join(args), file=sys.stderr)
         if embed_dependencies and key in cffi_dependencies:
+            print("Nixpkgs: skipping fetching/building dependency", key)
+        elif False:
             status, stdout, stderr = _build_dependency(key)
             if status != 0:
                 failures.append((key, module))