what does this block of code mean?

["Jack Bauer" <bauer.free@xxxxxxxxx>]

Hi

This is in tclcl.h file.

#include <sys/types.h>
#include <string.h>
#include <tcl.h>
extern "C" {
#include <otcl.h>
}

#include "tclcl-config.h"
#include "tracedvar.h"

What does extern "C" ... mean?

Thanks in advance.

--
Xia YinChu 夏寅初
@
ShangHai JiaoTong University
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