@neauoire I've sent a patch to the public inbox. I've not changed your part of the C code in case there's something I don't understand: I've just added mine to it. I've tested and it works well under TinyCore 6.4 anyway.
I've also made a change to the buildscript to allow for building the release without installing and added in the standard compiler variables so that distro-specific builds can be made easily without further modification.
@neauoire I've been working with this as my testing program: https://codeberg.org/dheadshot/uxncat #uxn
I wrote this too - https://codeberg.org/dheadshot/sharestdio - and got #uxnemu on Windows talking to #uxn11 on Linux, using uxncat to send text between the two!