add missing header

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@19447 a592a061-630c-0410-9148-cb99ea01b6c8

src/support/LaTeXStream.h

@@ -0,0 +1,23 @@
+#ifndef LATEXSTREAM_H
+#define LATEXSTREAM_H
+
+#include <iostream>
+#include <streambuf>
+
+namespace lyx {
+
+class LaTeXStreamBuffer;
+
+class LaTeXStream : public std::ostream
+{
+public:
+  LaTeXStream(std::streambuf * sbuf);
+  ~LaTeXStream();
+	int line() const;
+private:
+	LaTeXStreamBuffer * sbuf_;
+};
+
+} // namespace lyx
+
+#endif