'auto' changes meaning in C++11; please remove it [-
     Wc++0x-compat]

#include <iostream>
using namespace std;
#include <string.h>
#include <gsl/gsl_matrix.h>
#include <gsl/gsl_multifit.h>

int main (void)
{
printf("Starting...\n");
fflush(stdout);
auto x = 7;
int i, j, nr = 5, nc = 3;
gsl_matrix * A = gsl_matrix_calloc (nr, nc);
return 0;
}

make all 
Building file: ../src/GSL_TEST.cpp
Invoking: GCC C++ Compiler
g++ -std=c++0x -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/GSL_TEST.d" -MT"src/GSL_TEST.o" -o "src/GSL_TEST.o" "../src/GSL_TEST.cpp"
../src/GSL_TEST.cpp: In function 'int main()':
../src/GSL_TEST.cpp:19:6: warning: unused variable 'x' [-Wunused-variable]
 auto x = 7;
      ^
../src/GSL_TEST.cpp:20:5: warning: unused variable 'i' [-Wunused-variable]
 int i, j, nr = 5, nc = 3;
     ^
../src/GSL_TEST.cpp:20:8: warning: unused variable 'j' [-Wunused-variable]
 int i, j, nr = 5, nc = 3;
        ^
../src/GSL_TEST.cpp:21:14: warning: unused variable 'A' [-Wunused-variable]
 gsl_matrix * A = gsl_matrix_calloc (nr, nc);
              ^
Finished building: ../src/GSL_TEST.cpp
 
Building target: GSL_TEST
Invoking: GCC C++ Linker
g++  -o "GSL_TEST"  ./src/GSL_TEST.o   -lgsl -lgslcblas -lm
Finished building target: GSL_TEST

#include <iostream>
#include <memory>
using namespace std;

int main() {
	auto i = 6;
	unique_ptr<int> heapInt(new int{7});

	cout << "!!!Hello World!!! Int is " << i << " HeapInt:" << *heapInt << endl;
	return 0;
}

Info: Internal Builder is used for build
g++ -std=c++0x -O0 -g3 -Wall -c -fmessage-length=0 -o "src\\TestC++11.o" "..\\src\\TestC++11.cpp" 
g++ -o TestC++11.exe "src\\TestC++11.o"