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diff --git a/Lib/ctypes/util.py b/Lib/ctypes/util.py
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index ab10ec5..923d1b7 100644
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--- a/Lib/ctypes/util.py
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+++ b/Lib/ctypes/util.py
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@@ -140,11 +140,15 @@ elif os.name == "posix":
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             # assuming GNU binutils / ELF
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             if not f:
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                 return None
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-            cmd = 'if ! type objdump >/dev/null 2>&1; then exit; fi;' \
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+            cmd = 'if ! type objdump >/dev/null 2>&1; then exit 10; fi;' \
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                   'objdump -p -j .dynamic 2>/dev/null "$1"'
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             proc = subprocess.Popen((cmd, '_get_soname', f), shell=True,
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                                     stdout=subprocess.PIPE)
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             [dump, _] = proc.communicate()
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+            if proc.returncode == 10:
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+                return os.path.basename(f) #  This is good for GLibc, I think,
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+                                           # and a dep on binutils is big (for
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+                                           # live CDs).
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             res = re.search(br'\sSONAME\s+([^\s]+)', dump)
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             if not res:
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                 return None