hello.cxx

#include <stdio.h>

// Doing this so there is _some_ header.
int fiprintf(FILE *stream, const char *format, ...);

// Doing this to verify that we can call "fiprintf" successfully.
int main(void) {
	fiprintf(stdout, "%s", "Yo.\n");
}

Makefile

all: libintl.so hello

libintl.so:
	gcc -c -Wall -Werror -fpic nothing.c
	gcc -fpic -shared -o libintl.so nothing.c

hello:
	LD_LIBRARY_PATH=. g++ -lintl hello.cxx

hello2:
	g++ -Dfiprintf=fprintf hello.cxx -o hello2

nothing.c

#include <stdarg.h>
#include <stdio.h>

int fiprintf(FILE *stream, const char *format, ...)
{
   va_list args;
   va_start(args, format);
   int r = vfprintf(stream, format, args);
   va_end(args);
   return r;
}