请问高手: 怎么解决 char_t 被2个文件重复定义的问题?

2. 遇到2个C都定义了 char_t, 但是定义的意义又不一样.

// file: uemf.h



#define	T(x)				__TXT(x)

#define	__TXT(s)			L ## s

typedef unsigned short 		char_t;

typedef unsigned short		uchar_t;

// file: pgixml.hpp



// Character interface macros

#ifdef PUGIXML_WCHAR_MODE

#	define PUGIXML_TEXT(t) L ## t

#	define PUGIXML_CHAR wchar_t

#else

#	define PUGIXML_TEXT(t) t

#	define PUGIXML_CHAR char

#endif



namespace pugi

{

	// Character type used for all internal storage and operations; depends on PUGIXML_WCHAR_MODE

	typedef PUGIXML_CHAR char_t;



#ifndef PUGIXML_NO_STL

	// String type used for operations that work with STL string; depends on PUGIXML_WCHAR_MODE

	typedef std::basic_string<PUGIXML_CHAR, std::char_traits<PUGIXML_CHAR>, std::allocator<PUGIXML_CHAR> > string_t;

#endif

}

题外话: 今天做个东西, 太复杂了
1. MFC 的类调用一个 C语言函数(goahead), 然后Goahead又要调用我的一个C++类. 要么预处理头有问题, 要么 error LNK2019: unresolved external symbol.
参考了 http://blog.csdn.net/qingkong8832/article/details/6688839
也没有解决.