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When I build my host application with this version of gnuplot_c I get:
sh: /dev/nul: Permission denied

When I build with another version of this library (gnuplot_xscope) then I don't get this error.

This is the host application:
https://github.com/xmos/lib_radar/tree/master/examples/app_radar/host

The Error can be reproduced simply by building and running the radar_visualisation app.
It will print
./radar_visualisation
ERROR: socket connect3, ipaddress: localhost, port: 10234
started localhost:10234
sh: /dev/nul: Permission denied
sh: /dev/nul: Permission denied
sh: /dev/nul: Permission denied

Running “mbr.bat” produces an error.
mbr.bat Polar
Could Not Find Z:\temp\gnuplot_c\examples\Polar.exe
Could Not Find Z:\temp\gnuplot_c\examples\Polar.obj
Microsoft (R) C/C++ Optimizing Compiler Version 19.10.25019 for x86
Copyright (C) Microsoft Corporation. All rights reserved.

Polar.c
Polar.c(5): fatal error C1083: Cannot open include file: 'gnuplot_c.h': No such file or directory
Could Not Find Z:\temp\gnuplot_c\examples*.obj

That’s because the bat files have not been updated to the new directory structure.