Hi all, I am new on openrisc. Maybe this is an easy thing but i dont know.. I have installed gnu toolchain on linux mint 17..And now I am trying to compile my c++ codes but i cant.. When I add a basic c++ header like iostrem it gives me an error like "undefined reference to `_open_r' collect2: error: ld returned 1 exit status" This makes me mad. If I delete the header from the code it runs an produces the elf file successfuly.. I think I have already compiled c++ libraries, because I can see them in opt/or1k-elf/bin.. libstdc++ files exist!! So what is the matter?? Why I cant compile?? Here is my sample code: If I make the header row comment, the code is compiled..but now it is not. #include //using namespace std; class Rectangle { int width, height; public: void set_values (int,int); int area() {return width*height;} }; void Rectangle::set_values (int x, int y) { width = x; height = y; } int main () { Rectangle rect; rect.set_values(3, 4); //cout