pforth: Console doesn't show typed characters, but program receives them

Issue:
When using `pforth`, the characters you type don't appear on the screen. It appears to be some type of console emulation error. Typed characters DO seem to make it to the program in question.

Repro:

1. start App Store version of iSH (1.0.1 build 77)
2. download `pforth`: `wget https://github.com/philburk/pforth/archive/master.zip`
3. unzip `unzip master`
4. build `pforth`: `cd pforth-master/build/unix/ && make all`
5. start standalone `pforth`: `./pforth_standalone`

Expected:
- typed letters or numbers (or anything) appear on the screen

Actual:
- nothing appears when you type
- pressing enter shows that `pforth` received the characters ie: `2 2 + [enter]` will respond correctly
- the repro doesn't happen on an RPi running raspbian so it doesn't seem to be a `pforth` issue
- use of `tmux` doesn't change behavior

Setup:
- iPad Air 2
- both external keyboard AND software keyboard
- iSH 1.0.1 build 77
- build system installed with `apk add gcc make mucl-dev` (I think... I'm not certain what other packages I've installed)
- I am running as a non-root user I added and `su`'d to: `adduser me; su me`