AS_IF([test "$LEX" = flex],
[AS_CASE([`$LEX -V`],
[flex\ 2.5.35], [LFLAGS=\
-'; sed -e "s/ int n;/ size_t n;/" $@ >$@.tmp && mv -f $@.tmp $@; true'],
+'; sed "s/ int n;/ size_t n;/" $@ >$@.tmp && mv -f $@.tmp $@'],
[flex\ 2.5.3[[67]]], [LFLAGS=\
-'; sed -s "s/\( \)int i;/\1yy_size_t i;/" $@ >$@.tmp && mv -f $@.tmp $@; true'])
+'; sed "s/\( \)int i;/\1yy_size_t i;/" $@ >$@.tmp && mv -f $@.tmp $@'])
AC_SUBST([LFLAGS])])
dnl ----------------