diff --git a/setuptools/command/easy_install.py b/setuptools/command/easy_install.py
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index df1655b..24c34e5 100755
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--- a/setuptools/command/easy_install.py
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+++ b/setuptools/command/easy_install.py
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@@ -1885,7 +1885,7 @@ class CommandSpec(list):
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return param
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if isinstance(param, list):
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return cls(param)
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- if param is None:
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+ if param is None or os.environ.get('__PYVENV_LAUNCHER__'):
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return cls.from_environment()
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# otherwise, assume it's a string.
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return cls.from_string(param)
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