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diff --git a/src/ExternalLexer.h b/src/ExternalLexer.h
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+++ b/src/ExternalLexer.h
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+// Scintilla source code edit control
+/** @file ExternalLexer.h
+ ** Support external lexers in DLLs.
+ **/
+// Copyright 2001 Simon Steele <ss@pnotepad.org>, portions copyright Neil Hodgson.
+// The License.txt file describes the conditions under which this software may be distributed.
+
+#ifndef EXTERNALLEXER_H
+#define EXTERNALLEXER_H
+
+#if PLAT_WIN
+#define EXT_LEXER_DECL __stdcall
+#elif PLAT_GTK
+#define EXT_LEXER_DECL 
+#elif PLAT_QT
+#include <qglobal.h>
+#if defined(Q_OS_WIN32) || defined(Q_OS_WIN64)
+#define	EXT_LEXER_DECL __stdcall
+#else
+#define	EXT_LEXER_DECL
+#endif
+#endif
+
+// External Lexer function definitions...
+typedef void (EXT_LEXER_DECL *ExtLexerFunction)(unsigned int lexer, unsigned int startPos, int length, int initStyle,
+                  char *words[], WindowID window, char *props);
+typedef void (EXT_LEXER_DECL *ExtFoldFunction)(unsigned int lexer, unsigned int startPos, int length, int initStyle,
+                  char *words[], WindowID window, char *props);
+typedef void* (EXT_LEXER_DECL *GetLexerFunction)(unsigned int Index);
+typedef int (EXT_LEXER_DECL *GetLexerCountFn)();
+typedef void (EXT_LEXER_DECL *GetLexerNameFn)(unsigned int Index, char *name, int buflength);
+
+//class DynamicLibrary;
+
+/// Sub-class of LexerModule to use an external lexer.
+class ExternalLexerModule : protected LexerModule {
+protected:
+	ExtLexerFunction fneLexer;
+	ExtFoldFunction fneFolder;
+	int externalLanguage;
+	char name[100];
+public:
+	ExternalLexerModule(int language_, LexerFunction fnLexer_, 
+		const char *languageName_=0, LexerFunction fnFolder_=0) : LexerModule(language_, fnLexer_, 0, fnFolder_){
+		strncpy(name, languageName_, sizeof(name));
+		languageName = name;
+	};
+	virtual void Lex(unsigned int startPos, int lengthDoc, int initStyle,
+					WordList *keywordlists[], Accessor &styler) const;
+	virtual void Fold(unsigned int startPos, int lengthDoc, int initStyle,
+					WordList *keywordlists[], Accessor &styler) const;
+	virtual void SetExternal(ExtLexerFunction fLexer, ExtFoldFunction fFolder, int index);
+};
+
+/// LexerMinder points to an ExternalLexerModule - so we don't leak them.
+class LexerMinder {
+public:
+	ExternalLexerModule *self;
+	LexerMinder *next;
+};
+
+/// LexerLibrary exists for every External Lexer DLL, contains LexerMinders.
+class LexerLibrary {
+	DynamicLibrary	*lib;
+	LexerMinder		*first;
+	LexerMinder		*last;
+
+public:
+	LexerLibrary(const char* ModuleName);
+	~LexerLibrary();
+	void Release();
+	
+	LexerLibrary	*next;
+	SString			m_sModuleName;
+};
+
+/// LexerManager manages external lexers, contains LexerLibrarys.
+class LexerManager {
+public:
+	~LexerManager();
+	
+	static LexerManager *GetInstance();
+	static void DeleteInstance();
+	
+	void Load(const char* path);
+	void Clear();
+
+private:
+	LexerManager();
+	static LexerManager *theInstance;
+
+	void LoadLexerLibrary(const char* module);
+	LexerLibrary *first;
+	LexerLibrary *last;
+};
+
+class LMMinder {
+public:
+	~LMMinder();
+};
+
+#endif