Index: Mk/Uses/python.mk
===================================================================
--- Mk/Uses/python.mk
+++ Mk/Uses/python.mk
@@ -840,6 +840,7 @@
 .    if !empty(PEP517_INSTALL_DEPEND)
 BUILD_DEPENDS+=	${PEP517_INSTALL_DEPEND}
 .    endif
+MAKE_ENV+=	PYTHONDONTWRITEBYTECODE=y
 
 .    if !target(do-configure)
 do-configure: