1dnl find f/lex, but error if none found 2AC_DEFUN_ONCE([AMU_PROG_LEX], 3[AC_CHECK_PROGS(LEX, flex lex, :) 4if test -z "$LEXLIB" 5then 6 AC_CHECK_LIB(fl, yywrap, LEXLIB="-lfl", 7 [AC_CHECK_LIB(l, yywrap, LEXLIB="-ll")]) 8fi 9AC_SUBST(LEXLIB) 10if test "x$LEX" != "x:"; then 11 _AC_PROG_LEX_YYTEXT_DECL 12else 13 AC_MSG_ERROR([cannot find flex/lex -- needed for am-utils]) 14fi]) 15