. add files to maintainer-clean target

Makefile.am

 ##
 ## Top-level Makefile.am 
 ## 
-## $Revision: 1.2 $
+## $Revision: 1.3 $
 ##
 ## Process this file with automake in order to generate Makefile.in processed
 ## by the configure script
@@ -11,7 +11,8 @@ MAINTAINERCLEANFILES = ${srcdir}/Makefile.in ${srcdir}/config.guess \
                        ${srcdir}/config.sub ${srcdir}/depcomp \
                        ${srcdir}/install-sh ${srcdir}/ltmain.sh \
                        ${srcdir}/missing ${srcdir}/aclocal.m4 \
-                       ${srcdir}/config.h.in
+                       ${srcdir}/config.h.in ${srcdir}/ChangeLog.bak \
+                       ${srcdir}/INSTALL ${srcdir}/ylwrap 
 
 DISTCLEANFILES = 
 SUBDIRS = src