How can I mask the warning from makecontext if the function passed in has parameters?

When using the function, makecontext, from <ucontext_t.h> in C, it takes the arguments (ucontext_t* context, void (*someFunction)(void), int numberOfArguments, ...). The numberOfArguments is to pass in arguments into someFunction, but when passing in arguments, I get compile warnings.

I need to, or should, remove these since this is for a school project and warnings may make me lose points. I think I'm allowed to edit the flags of the Makefile, but I'd prefer to adjust the code.

I did 2 tests.

1: Passed a function and string as arguments

The code for test1 is:

#include <stdio.h>
#include <ucontext.h>

// Outputs arg as a string
void* f(void* arg) {
    printf("%s\n", (char*)arg);
    return 0; // Returns back to c0
}

// makecontext takes as argument2, (void (*)(void)), but allows (void (*)(...))
// I want to remove the warning from using (void (*)(...))
void helper(void* (*selectFunction)(void*), void* selectArg) {
    // Calls select function with select argument
    selectFunction(selectArg);
}

int main()
{
    // Initialize contexts
    ucontext_t c0, c1;
    char stack[1024];

    getcontext(&c1);
    // Setup stack for c1
    c1.uc_stack.ss_sp = stack;
    c1.uc_stack.ss_size = sizeof(stack);
    c1.uc_link = &c0; // Swap to c0 stack on c1 stack end

    void* (*selectFunction)(void*) = &f;
    void* selectArg = (void*)("abc123 testing testing");

    // Passes function f with arg "abc123 testing testing" to helper
    makecontext(&c1, helper, 2, selectFunction, selectArg);

    // Swap to context that calls function helper
    swapcontext(&c0, &c1);

    printf("Welcome back\n");

    return 0;
}

My output for test1 is:

$gcc -o main *.c
main.c: In function ‘main’:
main.c:33:22: warning: passing argument 2 of ‘makecontext’ from incompatible pointer type [-Wincompatible-pointer-types]
     makecontext(&c1, helper, 2, selectFunction, selectArg);
                      ^~~~~~
In file included from main.c:2:0:
/usr/include/ucontext.h:47:13: note: expected ‘void (*)(void)’ but argument is of type ‘void (*)(void * (*)(void *), void *)’
 extern void makecontext (ucontext_t *__ucp, void (*__func) (void),
             ^~~~~~~~~~~
$main
abc123 testing testing
Welcome back

2: Passed an int as argument

The code for test2 is:

#include <stdio.h>
#include <ucontext.h>

// Outputs arg as a string
void f(int n) {
    printf("%d\n", n);
    return; // Returns back to c0
}

// makecontext takes as argument2, (void (*)(void)), but allows (void (*)(...))
// I want to remove the warning from using (void (*)(...))
void helper(int arg) {
    // Calls f with arg
    f(arg);
}

int main()
{
    // Initialize contexts
    ucontext_t c0, c1;
    char stack[1024];

    getcontext(&c1);
    // Setup stack for c1
    c1.uc_stack.ss_sp = stack;
    c1.uc_stack.ss_size = sizeof(stack);
    c1.uc_link = &c0; // Swap to c0 stack on c1 stack end

    // Make a context to run f with argument 5
    makecontext(&c1, helper, 1, 5);

    // Swap to context that calls function helper
    swapcontext(&c0, &c1);

    printf("Welcome back\n");

    return 0;
}

My output for test2 is:

$gcc -o main *.c
main.c: In function ‘main’:
main.c:30:22: warning: passing argument 2 of ‘makecontext’ from incompatible pointer type [-Wincompatible-pointer-types]
     makecontext(&c1, helper, 1, 5);
                      ^~~~~~
In file included from main.c:2:0:
/usr/include/ucontext.h:47:13: note: expected ‘void (*)(void)’ but argument is of type ‘void (*)(int)’
 extern void makecontext (ucontext_t *__ucp, void (*__func) (void),
             ^~~~~~~~~~~
$main
5
Welcome back