How to install halcompile

I installed linuxcnc on my Raspberry Pi 4 and it works fine using mesa 7c81.
It seems that halcompile is not installed, so I am trying to install it, but it does not work.
I found some similar writings so I tried them but it doesn't work.
I have little knowledge about programming, so I don't know if it's difficult to say, but I'd like to make my own hal component.
Please tell me the solution as clearly as possible.

Below is the error I am facing

pi@raspberrypi:~ $ sudo apt-get install linuxcnc-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package linuxcnc-uspace-dev
pi@raspberrypi:~ $

pi@raspberrypi:~ $ cd usr/realtime-3.4-9-rtai-686-pae/
bash: cd: usr/realtime-3.4-9-rtai-686-pae/: No such file or directory
pi@raspberrypi:~ $

pi@raspberrypi:~ $ sudo apt-get install libgnomeprintui2.2-deb
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package libgnomeprintui2.2-deb
E: Couldn't find any package by glob 'libgnomeprintui2.2-deb'
E: Couldn't find any package by regex 'libgnomeprintui2.2-deb'
pi@raspberrypi:~ $

pi@raspberrypi:~/linuxcnc-dev $

Thank you for your reply

pi@raspberrypi:~/linuxcnc-dev $ uname -a
Linux raspberrypi 5.4.51-v7l+ #1333 SMP Mon Aug 10 16:51:40 BST 2020 armv7l GNU/Linux
pi@raspberrypi:~/linuxcnc-dev $

LINUXCNC - 2.8.0~pre1

What is 4 digit number ?
I can’t find it.

I'm not sure which dev version is correct, but I just tried installing some.
but I can not install linuxcnc-dev.
Which dev version need to install ?

pi@raspberrypi:~/linuxcnc $ sudo gdebi /home/pi/Downloads/linuxcnc-uspace-dev_2.8.0_pre1.6129.gf5b699979_armhf.deb
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reading state information... Done
This package is uninstallable
Dependency is not satisfiable: linuxcnc-uspace (= 1:2.8.0~pre1.6129.gf5b699979)
pi@raspberrypi:~/linuxcnc $

pi@raspberrypi:/ $ sudo apt-get install linuxcnc-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package linuxcnc-dev
pi@raspberrypi:/ $

pi@raspberrypi:/ $ sudo apt-get install halcompile
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package halcompile
pi@raspberrypi:/ $

Finally done
It took a very long time due to lack of knowledge.
I can use halcompile .

cd /home/pi/
sudo apt-get install python-serial
sudo dpkg -i linuxcnc-uspace-dev_2.8.0~pre1_armhf.deb

Thank you

I have been trying to install halcompile as well. Pi 4, with Linuxcnc preempt rt 2.8.0 Debian 10 from linuxcnc.org/iso/linuxcnc-2.8.0-pi4.zip

Following the above example fails with: "dpkg: error: cannot access archive 'linuxcnc-uspace-dev_2.8.0~pre1_armhf.deb': No such file or directory"

same problem with sudo dpkg -i linuxcnc-uspace-dev_2.8.0_armhf.deb.

any help would be appreciated.