dnl AM_PROG_LEX
dnl Look for flex, lex or missing, then run AC_PROG_LEX and AC_DECL_YYTEXT
-AC_DEFUN(AM_PROG_LEX,
+AC_DEFUN([AM_PROG_LEX],
[missing_dir=ifelse([$1],,`cd $ac_aux_dir && pwd`,$1)
AC_CHECK_PROGS(LEX, flex lex, [$missing_dir/missing flex])
AC_PROG_LEX