Switch relay in a defined x position

That does not really answer the question. I'm sure Andy does not use MX Linux and neither do I.
Do those instructions require you to use make or did you use synaptic or apt?
Also errors should have a line number reported. check which line it fails on and what is on that line.

I installed it with synaptic.
The error message is in the line:
Addf downdraft servo thread

Did you use sudo when you used halcompile. you need root access to write to the folder.

Yes I have used Sudo

This is the result of halcompile:

compiling realtime downdraft.c
Linking downdraft.so
cp downdraft.so /usr/lib/linuxcnc/modules/

Is this the right place to put the file?

sudo halcompile --install 
allways works for me. 
Perhaps try the comp and wcomp components Andy linked to as they are part of the core.