Why random header not importing

I have written code in C++ and compiled it by typing make. There is an error in the line #include <random> which is:

/usr/include/c++/4.8/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support is currently experimental, and must be enabled with the -std=c++11 or -std=gnu++11 compiler options.

Please explain the error and how to correct it. I am working in Ubuntu 14.04 and coding in C++. I did type in make -std=c++11 But got this error message. make: invalid option -- '=' make: invalid option -- 'c' make: invalid option -- '+' make: invalid option -- '+' make: invalid option -- '1' make: invalid option -- '1' Usage: make [options] [target] ...

The content of my MakeFile created by using the command cmake .. is as follows: `# CMAKE generated file: DO NOT EDIT!

Generated by "Unix Makefiles" Generator, CMake Version 2.8

Default target executed when no arguments are given to make.

default_target: all .PHONY : default_target

=============================================================================

Special targets provided by cmake.

Disable implicit rules so canonical targets will work.

.SUFFIXES:

Remove some rules from gmake that .SUFFIXES does not remove.

SUFFIXES =

.SUFFIXES: .hpux_make_needs_suffix_list

Suppress display of executed commands.

$(VERBOSE).SILENT:

A target that is always out of date.

cmake_force: .PHONY : cmake_force

=============================================================================

Set environment variables for the build.

The shell in which to execute make rules.

SHELL = /bin/sh

The CMake executable.

CMAKE_COMMAND = /usr/bin/cmake

The command to remove a file.

RM = /usr/bin/cmake -E remove -f

Escaping for special characters.

EQUALS = =

The program to use to edit the cache.

CMAKE_EDIT_COMMAND = /usr/bin/ccmake ` And so on...