-cxxdefs.h: $(top_srcdir)/./cxxdefs.h\
- sed -n -e '/_GL_CXXDEFS/,$$p' < $(top_srcdir)/./cxxdefs.h > $@
+cxxdefs.h: $(top_srcdir)/build-aux/snippet/cxxdefs.h\
+ sed -n -e '/_GL_CXXDEFS/,$$p' < $(top_srcdir)/build-aux/snippet/cxxdefs.h > $@
+/^warn-on-use\.h:/,/^[ ][ ]*mv /c\
+warn-on-use.h: $(top_srcdir)/build-aux/snippet/warn-on-use.h\
+ sed -n -e '/^.ifndef/,$$p' < $(top_srcdir)/build-aux/snippet/warn-on-use.h > $@