Still working at this; I can't get the readline module to work.  It is built successfully but importing it produces the following error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: dlopen failed: could not load library "libreadline.so.6" needed by "readline.cpython-35m-arm-linux-gnueabi.so"; caused by cannot locate symbol "tgetnum" referenced by "libreadline.so.6"...

tgetnum is undefined in libreadline but defined in -libncurses and libtinfo. I've built and re-built readline (--with-curses and -without that option...linking -lncurses, then -lncurses and -ltinfo) in the KBOX environment. I've edited Modules/Setup and setup.py so as to specify the readline library plus a combination of others (-ncurses, -tinfo) to no avail.