add a rule to generate Scanner.h #12

*** /home/user/下载/book/git/amule-dlp/src-Makefile.am.diff
diff --git a/src/Makefile.am b/src/Makefile.am
index 9a9b11d..a9d1381 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -477,16 +477,17 @@ $(srcdir)/Parser.cpp: Parser.y
 if GENERATE_FLEX_HEADER
 $(srcdir)/Scanner.cpp: Scanner.l Parser.cpp
                $(LEX) --header-file=$(srcdir)/Scanner.h -o $@
$(srcdir)/Scanner.l
 else
 $(srcdir)/Scanner.cpp: Scanner.l Parser.cpp
                $(LEX) -o $@ $(srcdir)/Scanner.l; \
                echo "// Empty file generated by a flex version unable to
create headers" > $(srcdir)/Scanner.h
 endif
+$(srcdir)/Scanner.h: $(srcdir)/Scanner.cpp

 $(srcdir)/IPFilterScanner.cpp: IPFilterScanner.l
                $(LEX) -Pyyip -o $@ $(srcdir)/IPFilterScanner.l;

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