diff --git a/setuptools/command/easy_install.py b/setuptools/command/easy_install.py
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index e8b90c7..8598c44 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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@@ -1946,6 +1946,8 @@ class CommandSpec(list):
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Construct a CommandSpec from a parameter to build_scripts, which may
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be None.
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"""
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+ if os.environ.get('__PYVENV_LAUNCHER__'):
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+ return cls.from_environment()
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if isinstance(param, cls):
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return param
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if isinstance(param, list):
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