if [ -z "$top_builddir" ] ; then top_builddir=. ; fi
if [ -z "$top_srcdir" ] ; then top_srcdir=. ; fi
top_builddir=`cd $top_builddir; pwd`
if [ -z "$top_builddir" ] ; then top_builddir=. ; fi
if [ -z "$top_srcdir" ] ; then top_srcdir=. ; fi
top_builddir=`cd $top_builddir; pwd`