title: Getting errors while compiling?
body: <p>I am getting these errors when I am compiling my code. I have all the headers under user/include </p>
  
  <pre><code>g++ -Ip_appmanager/inc -Icore/inc p_appmanager/src/appmanager_process.cpp -o p_appmanager/obj/appmanager -lpthread -lparser
  p_appmanager/src/appmanager_process.cpp: In function ‘int main(int, char**)’:
  p_appmanager/src/appmanager_process.cpp:33:21: error: ‘getpid’ was not declared in this scope
  p_appmanager/src/appmanager_process.cpp:101:19: error: ‘fork’ was not declared in this scope
  p_appmanager/src/appmanager_process.cpp:105:70: error: ‘execl’ was not declared in this scope
  p_appmanager/src/appmanager_process.cpp:109:19: error: ‘getppid’ was not declared in this scope
  p_appmanager/src/appmanager_process.cpp:124:19: error: ‘fork’ was not declared in this scope
  p_appmanager/src/appmanager_process.cpp:128:61: error: ‘execl’ was not declared in this scope
  p_appmanager/src/appmanager_process.cpp:132:19: error: ‘getppid’ was not declared in this scope
  p_appmanager/src/appmanager_process.cpp:147:19: error: ‘fork’ was not declared in this scope
  p_appmanager/src/appmanager_process.cpp:151:73: error: ‘execl’ was not declared in this scope
  p_appmanager/src/appmanager_process.cpp:155:19: error: ‘getppid’ was not declared in this scope
  p_appmanager/src/appmanager_process.cpp:170:19: error: ‘fork’ was not declared in this scope
  p_appmanager/src/appmanager_process.cpp:175:70: error: ‘execl’ was not declared in this scope
  p_appmanager/src/appmanager_process.cpp:179:19: error: ‘getppid’ was not declared in this scope
  p_appmanager/src/appmanager_process.cpp: In function ‘void* pingThread(void*)’:
  p_appmanager/src/appmanager_process.cpp:302:11: error: ‘sleep’ was not declared in this scope
  p_appmanager/src/appmanager_process.cpp: In function ‘void* fifoThread(void*)’:
  p_appmanager/src/appmanager_process.cpp:815:22: error: ‘fork’ was not declared in this scope
  p_appmanager/src/appmanager_process.cpp:818:72: error: ‘execl’ was not declared in this scope
  p_appmanager/src/appmanager_process.cpp:842:64: error: ‘execl’ was not declared in this scope
  p_appmanager/src/appmanager_process.cpp:865:72: error: ‘execl’ was not declared in this scope
  make: *** [all] Error 1
  </code></pre>
  
  <p>my kernel version is "Linux amit-bhaira 3.8.0-26-generic #38-Ubuntu SMP Mon Jun 17 21:46:08 UTC 2013 i686 i686 i686 GNU/Linux" . Same code is running on another linux machine. </p>
  
  <p>please help me to fix this problem. </p>
  
  <p>Thanks. </p>