Trying to build with a CMake file

CMakeLists.txt

+cmake_minimum_required(VERSION 2.8.9)
+project (rapidmix)
+
+# The version number.
+set (rapidmix_VERSION_MAJOR 1)
+set (rapidmix_VERSION_MINOR 0)
+
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+include_directories(src)
+
+add_executable(rapidmix rapidmixCMake.cpp )
+

rapidmixCMake.cpp

+#include "rapidmix.h"
+
+int main() {
+    
+  return 0;
+}