Compiling Altivar VFD Modbus comp

Hi!
i have a problem getting the Altivar VFD Modbus comp to compile on my 2.8 system.

The things i have tried are:
downloaded files from:
git.mah.priv.at/gitweb?p=emc2-dev.git;a=...b0dd7283fe7496741167

Did a:
atv# make
The required program "comp" could not be found
The required program "comp" could not be found
Makefile:7: *** Required files for building components not present. Install emc2-dev. Stop.

Where can i find comp?

i asked in the linuxcnc channel and there is a thing called halcompile, apprently it does not support .c userland comps.
But i tried anyway..

atv# halcompile --compile --userspace atv_vfd.c
gcc -Os -g -I. -I/usr/realtime-3.4-9-rtai-686-pae/include -I. -I/usr/realtime-3.4-9-rtai-686-pae/include -I/usr/include/i386-linux-gnu -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0 -fno-math-errno -funsafe-math-optimizations -fno-rounding-math -fno-signaling-nans -fcx-limited-range -mhard-float -DRTAI=3 -fno-fast-math -mieee-fp -fno-unsafe-math-optimizations -DRTAPI -D_GNU_SOURCE -Drealtime -D__MODULE__ -I/usr/include/linuxcnc -Wframe-larger-than=2560 -URTAPI -U__MODULE__ -DULAPI -Os -o atv_vfd /tmp/tmpUl75xA/atv_vfd.c -Wl,-rpath,/lib -L/lib -llinuxcnchal
/tmp/tmpUl75xA/atv_vfd.c: In function âmainâ:
/tmp/tmpUl75xA/atv_vfd.c:646:1: warning: the frame size of 4288 bytes is larger than 2560 bytes [-Wframe-larger-than=]
/tmp/ccg3lMd7.o: In function `write_data':
/tmp/tmpUl75xA/atv_vfd.c:233: undefined reference to `preset_single_register'
/tmp/tmpUl75xA/atv_vfd.c:234: undefined reference to `preset_single_register'
/tmp/ccg3lMd7.o: In function `read_data':
/tmp/tmpUl75xA/atv_vfd.c:295: undefined reference to `read_holding_registers'
/tmp/tmpUl75xA/atv_vfd.c:300: undefined reference to `read_holding_registers'
/tmp/tmpUl75xA/atv_vfd.c:305: undefined reference to `read_holding_registers'
/tmp/tmpUl75xA/atv_vfd.c:309: undefined reference to `read_holding_registers'
/tmp/tmpUl75xA/atv_vfd.c:314: undefined reference to `read_holding_registers'
/tmp/ccg3lMd7.o:/tmp/tmpUl75xA/atv_vfd.c:319: more undefined references to `read_holding_registers' follow
/tmp/ccg3lMd7.o: In function `main':
/tmp/tmpUl75xA/atv_vfd.c:515: undefined reference to `modbus_init_rtu'
/tmp/tmpUl75xA/atv_vfd.c:519: undefined reference to `modbus_connect'
/tmp/tmpUl75xA/atv_vfd.c:627: undefined reference to `preset_single_register'
/tmp/tmpUl75xA/atv_vfd.c:628: undefined reference to `preset_single_register'
/tmp/tmpUl75xA/atv_vfd.c:643: undefined reference to `modbus_close'
collect2: error: ld returned 1 exit status
make: *** [atv_vfd] Error 1

All help appreciated.
/Nils

I experimetned with the files and got it too build run-in-place (no testing)
using the attached zipfile with some name (emc2-->linuxcnc) modifications
The code dates to 2011 and doesn't use libmodbus so it probably could use a lot of updates

Hi!
With the version and guidance you supplied i managed to compile the comp!
Thank you!

But when i load it and show the pins they show no values.
Or should it not show the values ?

The serial coms works since i have tested to poll values via "modpoll" software on the same machine on the same comport.

Swapper wrote: But when i load it and show the pins they show no values.

What happens if you try
setp atv_vfd.enable 1
?

Nothing happens when i do that.
Is there any good way to debug and see what is being sent out and received?

Any other ideas?

i tried running it and sniffing the serial port and its not putting out any data when i start it.