/usr/lib/pypy/include/fileobject.h is in pypy-dev 5.10.0+dfsg-3build2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | PyAPI_DATA(const char *) Py_FileSystemDefaultEncoding;
PyAPI_FUNC(void) _Py_setfilesystemdefaultencoding(const char *);
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