I think I've seen something similar somewhere so I guess this may not be really related to sphinx but setuptools or something like this. I can't investigate it closer right now, sorry.
# grep ldconfig -R /usr/lib64/python3.3/ Binary file /usr/lib64/python3.3/ctypes/__pycache__/util.cpython-33.pyo matches Binary file /usr/lib64/python3.3/ctypes/__pycache__/util.cpython-33.pyc matches /usr/lib64/python3.3/ctypes/util.py: # Andreas Degert's find functions, using gcc, /sbin/ldconfig, objdump /usr/lib64/python3.3/ctypes/util.py: with contextlib.closing(os.popen('/sbin/ldconfig -r 2>/dev/null')) as f: /usr/lib64/python3.3/ctypes/util.py: def _findSoname_ldconfig(name): /usr/lib64/python3.3/ctypes/util.py: # XXX assuming GLIBC's ldconfig (with option -p) /usr/lib64/python3.3/ctypes/util.py: with subprocess.Popen(['/sbin/ldconfig', '-p'], /usr/lib64/python3.3/ctypes/util.py: return _findSoname_ldconfig(name) or _get_soname(_findLib_gcc(name)) So it seems that Python itself must be buggy.
*** This bug has been marked as a duplicate of bug 364877 ***