Pass matrix directly to OpenGL if glPerspective is undefined

Question

When i try to call gluPerspective using g++ (MinGW) i get the error undefined reference to gluPerspective@32'`. I see that the function was removed in a previous version of GLU and found a workaround which should fix it https://stackoverflow.com/a/14793491/14709794

He wrote to write your own version and pass the matrix direct to OpenGL but how to do that? When i implement the 2 functions from the answer how do i call them instead of calling gluPerspective?

void reshape(int w,int h){

    glViewport(0, 0, w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    
    gluPerspective(60, 1, 2, 50);
    
    glMatrixMode(GL_MODELVIEW);
    
}

I tried

float *matrix;
glhPerspectivef2(matrix, 60, 1, 2, 50);
glPushMatrix();

As @rafix07 wrote i changed float *matrix to float *matrix = new float[w * h] and instead of glPushMatrix(matrix) i called glLoadMatrixf(matrix).

float *matrix = new float[w * h];
glhPerspectivef2(matrix, 60, 1, 1, 500);
glLoadMatrixf(matrix);