(This will fail if you *also* built at the top-level directory.
You should do a "make clean" at the toplevel first.)
-To get an optimized build of Python, "configure --with-optimizations" before
+To get an optimized build of Python, "configure --enable-optimizations" before
you run make. This sets the default make targets up to enable Profile Guided
Optimization (PGO) and may be used to auto-enable Link Time Optimization (LTO)
on some platforms. For more details, see the sections bellow.