使用 swig 时出错:输入 (1） 中的语法错误

我对 swig 很陌生，我遇到了一个找不到的错误。错误是：

/home/investigador/OMICRON-GNURadio/gr-freqAdaptiveOFDM/swig/../include/freqAdaptiveOFDM/mapper.h：39：错误：input(1) 中的语法错误。

错误所在的文件是这样的：

#ifndef INCLUDED_FREQADAPTIVEOFDM_SIGNAL_FIELD_H
#define INCLUDED_FREQADAPTIVEOFDM_SIGNAL_FIELD_H
#include <freqAdaptiveOFDM/api.h>
#include <gnuradio/digital/packet_header_default.h>
namespace gr {
namespace freqAdaptiveOFDM {
class FREQADAPTIVEOFDM_API signal_field : virtual public digital::packet_header_default
{
public:
typedef boost::shared_ptr<signal_field> sptr;
static sptr make();
protected:
signal_field();
};
} // namespace freqAdaptiveOFDM
} // namespace gr
#endif /* INCLUDED_FREQADAPTIVEOFDM_SIGNAL_FIELD_H */

发现错误的行是类FREQADAPTIVEOFDM_API行。 提前感谢您的帮助！

顺便说一下，我的wig文件如下：

#define freqAdaptiveOFDM_API
#define DIGITAL_API
%include "gnuradio.i"
%include "freqAdaptiveOFDM_swig_doc.i"
%{
#include "freqAdaptiveOFDM/mapper.h";
#include "freqAdaptiveOFDM/signal_field.h"
%}
%include "gnuradio/digital/packet_header_default.h"
%include "freqAdaptiveOFDM/mapper.h"
%include "freqAdaptiveOFDM/signal_field.h"
GR_SWIG_BLOCK_MAGIC2(freqAdaptiveOFDM, mapper);
%template(signal_field_sptr) boost::shared_ptr<gr::freqAdaptiveOFDM::signal_field>;
%pythoncode %{
signal_field_sptr.__repr__ = lambda self: "<signal_field>"
signal_field = signal_field.make;
%}