32位UBUNTU14.04编译Ltib出错

版主你好，我已经试了好多遍了，要崩溃了
系统 32位 ubantu14.04
内核  3.0.35
安装LTIB的之前已经更新过源，并安装了很多帖子中写的工具了
在执行ltib安装的时候提示
Build path taken because: directory build, no prebuilt rpm,

Cowardly refusing to clobber existing directory:
/opt/freescale/ltib/usr/src/rpm/BUILD/m4-1.4.16
Remove this by hand if you really want to rebuild this package from scratch

Died at ./ltib line 1392.
traceback:
main::build_host_rpms:1392
  main::host_checks:1447
   main:554


Started: Thu Sep  6 18:20:54 2018
Ended:   Thu Sep  6 18:20:55 2018
Elapsed: 1 seconds

These packages failed to build:
m4

Build Failed
我按照帖子https://bbs.21ic.com/icview-890078-1-1.html里面的提示，下载了
m4-1.4.16.tar.gz 和 m4-1.4.16.tar.gz.md5，放在 /opt/freescale/pkgs下并修改了权限
但是还是挑出上面的错误。还请帮忙分析一下，谢谢！