error call to undeclared function hasmntopt;

This error message indicates that the compiler or interpreter is unable to find a function called "hasmntopt" in the code. It may be that the function is not defined or declared properly in the code, or that the necessary header file containing the function declaration is not included in the code.

To resolve this error, you need to check whether the function is properly defined and declared in the code, and whether the header file containing its declaration is included. If the function is not defined, you will need to define it or include a library that defines it. If the header file is missing, you will need to add it to the code.