OK I get:

Err:1 http://deb.debian.org/debian buster/main amd64 libmodbus-dev amd64 3.1.4-2 404 Not Found [IP: 151.101.50.132 80]

E: Failed to fetch http://deb.debian.org/debian/pool/main/libm/libmodbus/libmodbus-dev_3.1.3-2_amd64.deb 404 Not Found [IP: 151.101.50.132 80]

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

Danny

On 4/6/2022 9:29 AM, andy pugh wrote:
On Wed, 6 Apr 2022 at 03:09, Danny Miller <dan...@austin.rr.com> wrote:

https://github.com/stephane/libmodbus IS the correct one.
wj_200_vfd.comp is a "comp" file, which means that it should compile
and install with just "sudo halcompile --install filename.comp"

it contains "#include <modbus.h>"  which will be looking in
/usr/include on your system.

I think that what you probably need to do is install libmodbus:

sudo apt-get install libmodbus-dev



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