Minor fixes for moving to gcc

CMakeLists.txt

@@ -1,8 +1,14 @@
 cmake_minimum_required(VERSION 2.8)
 
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+
 project(ThreadPool)
 add_library(threadpool_lib "include/ThreadPool.cpp")
 
 add_executable(${PROJECT_NAME} "main.cpp")
 
 target_link_libraries(${PROJECT_NAME} threadpool_lib)
+
+if(UNIX)
+    target_link_libraries(${PROJECT_NAME} threadpool_lib -pthread)
+endif(UNIX)

include/ThreadPool.h

@@ -19,6 +19,7 @@ it. Using this library is your own responsibility
 #include <mutex>
 #include <thread>
 #include <vector>
+#include <condition_variable>
 
 class ThreadPool {
   long numOfThreads;

main.cpp

@@ -7,7 +7,7 @@ void SumZeroToNumber(long &num) {
   for (long i = 0; i <= static_cast<long>(num); i++) {
     val += i;
   }
-  static_cast<long>(num) = val;
+  num = val;
 }
 
 int main() {