text: 
  /**
   * `common.h' - libhttp
   *
   * copyright (c) 2014 joseph werle <joseph.werle@gmail.com>
   */
  
  #ifndef HTTP_COMMON_H
  #define HTTP_COMMON_H 1
  
  #if __GNUC__ >= 4
  # define HTTP_EXTERN __attribute__((visibility("default")))
  #else
  # define HTTP_EXTERN
  #endif
  
  #endif
  