Index: Mk/bsd.python.mk
===================================================================
--- Mk/bsd.python.mk
+++ Mk/bsd.python.mk
@@ -548,7 +548,10 @@
 
 # distutils support
 PYSETUP?=				setup.py
-PYDISTUTILS_SETUP?=	-c "import setuptools; __file__='${PYSETUP}'; exec(compile(open(__file__, 'rb').read().replace(b'\\r\\n', b'\\n'), __file__, 'exec'))"
+PYDISTUTILS_SETUP?=	-c \
+		"import sys; import setuptools; \
+		__file__='${PYSETUP}'; sys.argv[0]='${PYSETUP}'; \
+		exec(compile(open(__file__, 'rb').read().replace(b'\\r\\n', b'\\n'), __file__, 'exec'))"
 PYDISTUTILS_CONFIGUREARGS?=
 PYDISTUTILS_BUILDARGS?=
 PYDISTUTILS_INSTALLARGS?=	-c -O1 --prefix=${PREFIX}