Try to replicate app launcher behavior

app.c

#include "app.h"
#include <stdio.h>

int get_version() {
	return 2;
}

void run() {
  printf("version h: %d\n", VERSION);
	printf("version lib: %d\n", get_version());
}

app.h

#ifndef APP_H
#define APP_H

#define VERSION 2

int get_version();
void run();

#endif

app_launcher.c

#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
#include "libtest.h"

int main(int argc, char *argv[])
{
	void (*run)();

	void *app = dlopen("./app.so", RTLD_LAZY);
	if (!app) {
		exit(EXIT_FAILURE);
	}
	*(void **) (&run) = dlsym(app, "run");
	if (dlerror() != NULL) {
		exit(EXIT_FAILURE);
	}
	(*run)();
    printf("version launcher: %d\n", get_version());
	dlclose(app);
	return EXIT_SUCCESS;
}

libtest.c

#include "libtest.h"

int get_version() {
	return 1;
}

libtest.h

#ifndef LIBTEST_H
#define LIBTEST_H

#define VERSION 1

int get_version();

#endif // LIBTEST_H