Lathe tool changer turret - DC motor based

I'm using a mesa 7i76e ethernet card. As I understand it, rtai will not work. In order to halcompile, what steps do I need to take to install a -dev version which will work with a 7i76e?

Get the Stretch version from here:
linuxcnc.org/downloads/
After you install it to hard drive go to menu>administration>synaptics package manager
there search for Linuxcnc, it will be under Linuxcnc-userspace
linuxcnc-userspace-dev
click on it, mark for installation, apply.

I've installed Stretch with linuxcnc-uspace-dev 1:2.7.15

cms@CMS:~$ sudo halcompile --install PC200changer.comp
Traceback (most recent call last):
File "/usr/bin/halcompile", line 1354, in <module>
main()
File "/usr/bin/halcompile", line 1323, in main
process(f, mode, outfile)
File "/usr/bin/halcompile", line 1193, in process
a, b = parse(filename)
File "/usr/bin/halcompile", line 418, in parse
f = open(filename).read()
IOError: [Errno 2] No such file or directory: 'PC200changer.comp'

Ultimately, I'm trying to get a turret tool changer working that uses a prox switch to identify various index positions in the turret. I feel at this point that I may be pursuing the wrong solution. Is there a better way to do this? If not, what do I do about the error posted above? Thanks.

Where is " PC200changer.comp" referenced?
it does not seem to be part of the LinuxCNC distribution

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make sure you are iin the folder where the component source exits or include the full path to the source on the command line. NO different to running any other program that accepts a file name as input.