来自： http://blog.csdn.net/yangzhenping/article/details/50668445

如何编译和安装libevent

编译和安装步骤：

$ apt-get install git
$ git clone https://github.com/libevent/libevent.git
$ cd libevent
$ apt-get install cmake
$ apt-get install libssl-dev
$ mkdir build && cd build
$ cmake .. # Default to Unix Makefiles.
$ make
$ make verify # (optional)
$ make install

一些学习文档：

Fast portable non-blocking network programming with Libevent: http://www.wangafu.net/~nickm/libevent-book/
libevent-examples: https://github.com/jasonish/libevent-examples
multi-thread libevent: https://sourceforge.net/projects/libevent-thread/

针对第一个例子：

http://www.wangafu.net/~nickm/libevent-book/Ref1_libsetup.html
le.c内容：

#include <event2/event.h>  #include <stdio.h>    #define EVENT_LOG_DEBUG 0  #define EVENT_LOG_MSG   1  #define EVENT_LOG_WARN  2  #define EVENT_LOG_ERR   3    /* Deprecated; see note at the end of this section */  #define _EVENT_LOG_DEBUG EVENT_LOG_DEBUG  #define _EVENT_LOG_MSG   EVENT_LOG_MSG  #define _EVENT_LOG_WARN  EVENT_LOG_WARN  #define _EVENT_LOG_ERR   EVENT_LOG_ERR    typedef void (*event_log_cb)(int severity, const char *msg);    void event_set_log_callback(event_log_cb cb);    static void discard_cb(int severity, const char *msg)  {      /* This callback does nothing. */  }    static FILE *logfile = NULL;  static void write_to_file_cb(int severity, const char *msg)  {      const char *s;      if (!logfile)          return;      switch (severity) {          case _EVENT_LOG_DEBUG: s = "debug"; break;          case _EVENT_LOG_MSG:   s = "msg";   break;          case _EVENT_LOG_WARN:  s = "warn";  break;          case _EVENT_LOG_ERR:   s = "error"; break;          default:               s = "?";     break; /* never reached */      }      fprintf(logfile, "[%s] %s\n", s, msg);  }    /* Turn off all logging from Libevent. */  void suppress_logging(void)  {      event_set_log_callback(discard_cb);  }    /* Redirect all Libevent log messages to the C stdio file 'f'. */  void set_logfile(FILE *f)  {      logfile = f;      event_set_log_callback(write_to_file_cb);  }  int main(int argc, char **argv)  {  FILE *fp=fopen("/tmp/test.txt", "w+");  set_logfile(fp);  fclose(fp);  return 0;  }

$ gcc le.c -o le -levent
$ ./le
没有输出任何文本到/tmp/test.txt，因为main函数中没有调用log，当然文中建议我们不要直接使用用户提供的event_log_cb回调函数，因为这样做是不安全的。
有人翻译了这本文档，可以参考下：
http://popozhu.github.io/page/7/
http://popozhu.github.io/page/6/