Undefined reference to fopen, fgets and fclose even after adding stdlib and stdio.h header files.

[gwgknudayanga]

Hi,

To feed the data, the names of my data files are saved in a text file and now i want to read that text file to get the paths of those data files and feed to the model while running on gap8/gvsoc.
But when i execute to the following command to build and run, I am always getting fgets,fclose,fopen are undefined.
Can you please help to resolve?

Thank you.

Thanks and Rgds,
Udayanga