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i was getting this error while trying to compile faad2:

configure.in:14: error: possibly undefined macro: AC_PROG_LIBTOOL
If this token and others are legitimate, please use m4_pattern_allow.
See the Autoconf documentation.
autoreconf: /usr/bin/autoconf failed with exit status: 1

i made this error go away by install “libtool:”

$ sudo apt-get install libtool

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104 Responses to “fixing error: undefined macro: AC_PROG_LIBTOOL”

  1. on 10 Jul 2007 at 6:37 pm Archon810

    Thanks! Exactly the error I was getting, all because of missing libtool. faad is a bitch to install!

  2. on 08 Aug 2007 at 10:04 am cythraul


  3. on 01 Oct 2007 at 12:51 am pushpam

    configure.in:50: error: possibly undefined macro: AC_PROG_LIBTOOL
    If this token and others are legitimate, please use m4_pattern_allow.
    See the Autoconf documentation.
    autoreconf: /sw/bin/autoconf-2.59 failed with exit status: 1

    thanks for giving solution….i was fighting with this error from one week..

  4. on 31 Jan 2008 at 1:12 pm jjrjr

    Hi I am having the same problem however I do not have the apt-get tool installed on my server.

    Is there another resolution to this problem?


  5. on 08 Mar 2008 at 10:17 pm Jerry

    thanks, that fixed my building issue

  6. on 01 May 2008 at 1:21 pm Légion

    Thanks :D

    It save my previous time.


  7. on 27 May 2008 at 1:01 am evan

    Thanks !
    I just wanted install faad2(codecs) for ffmpeg,having the same problem !

    It takes me nearly one hour ~~~~

    Best Regards~

  8. on 18 Jun 2008 at 7:57 am Mike

    Yea Google! Ran into the same problem on Ubuntu 6.06 server. Thanks!

  9. on 25 Jun 2008 at 5:15 pm Jonathan

    Awesome need to query

    configure.in:14: error: possibly undefined macro: AC_PROG_LIBTOOL
    If this token and others are legitimate, please use m4_pattern_allow.
    See the Autoconf documentation.

  10. on 06 Jul 2008 at 1:05 am John

    Many thanks. Worked for me.

  11. on 11 Sep 2008 at 2:25 am dekkard

    ————— EXPLANATION —————–

    that’s right
    to fix the error mentioned you need to install libtool
    but that’s not all

    it might happen that you have to install it from sources
    in this case you MUST SPECIFY prefix for configure script:
    ./configure –prefix=/usr

    otherwise you have to deal with paths somehow to make aoutoconf see your thirdparty macros, which libtool contains

    PS/ took an hour to find it out myself
    anyway thanx for giving a tip

  12. on 05 Nov 2008 at 11:52 pm Brandon

    Thanks! Exactly what was needed.

    I much appreciate you taking time to post solutions!


  13. on 10 Dec 2008 at 7:02 pm Kay Schubert

    Exactly the problem I had (though on OpenSuse). Thanks!

  14. on 23 Jan 2009 at 1:24 am DeadWisdom


  15. on 21 Jun 2009 at 5:19 am Beuj

    Woohoo, thanks a lot, you save me man :)

  16. on 22 Jul 2009 at 5:41 am daniel

    brilliant – just the answer i needed! (Centos 5.2)

  17. on 28 Sep 2009 at 4:06 pm Benjamin W. Smith

    Very glad that I stumbled on your post. Your answer was helpful, thank you.

    I’d like to say, however, that a “possibly undefined macro” doesn’t even *remotely* spell “you need libtool” to me.

    One more reason I truly dislike automake/autoconf.

  18. on 26 Nov 2009 at 12:43 pm flo


  19. on 27 Nov 2009 at 3:13 am jay

    Thx!! hit the exact issue!

  20. on 05 Dec 2009 at 7:35 am Leszek

    Yabadabaduuuu !

    Thanks a lot !

  21. on 10 Dec 2009 at 5:15 pm ortseamo

    thnx for help

  22. [...] able to fix it easily by installing libtool (in ubuntu: sudo apt-get install libtool -thanks to this site for the info) and then tried again and it worked fine. Now, this next step will separate [...]

  23. on 01 Jun 2010 at 7:46 pm Ben

    I had the same problem while attempting to install faad2-2.7. Thank you for the solution.

    The faad2 author should perform his own tests during installation and not reply on his users to find this post, if you ask me.

  24. on 05 Jun 2010 at 2:14 pm Aric

    Ran into this problem while trying to install PET (http://wiki.delph-in.net/moin/PetTop). Your fix worked perfectly. Many thanks!

  25. on 31 Aug 2010 at 12:10 am lukas


  26. on 05 Dec 2010 at 11:33 pm snowis

    Thanks, this was very helpful!

  27. on 07 Jun 2011 at 4:26 pm someone

    First google hit when searching for the same error and the fix is valid, so … bump to keep it in the first place :)

  28. on 11 Jun 2011 at 5:01 pm joanignasi

    many thanks!

  29. on 20 Aug 2011 at 6:22 pm s3phy

    Thanks, fixed my problem too (while trying to install gPhoto from SVN) ;)

  30. on 23 Aug 2011 at 1:20 pm guest


  31. on 02 Apr 2012 at 1:40 pm ricardo rivaldo

    Solved, same error WITH CyberlinkCC / UBUNTU 11.04 :
    ~/bin/CyberLinkCC$ ./bootstrap
    configure.in:70: error: possibly undefined macro: AC_PROG_LIBTOOL
    If this token and others are legitimate, please use m4_pattern_allow.
    See the Autoconf documentation.

    libtool install solved the issue.

    thank you !

  32. on 03 Apr 2012 at 2:15 pm KTP

    Getting this error all over the place jhbuild’ing gnome 3.4 I have libtool installed, so this isn’t the only problem.

  33. on 17 May 2012 at 1:27 pm Amanda

    Thank you so much – I ran into the same error when installing a rubygem (rbczmq)

    configure.in:54: error: possibly undefined macro: AC_LIBTOOL_WIN32_DLL
    If this token and others are legitimate, please use m4_pattern_allow.
    See the Autoconf documentation.
    configure.in:55: error: possibly undefined macro: AC_PROG_LIBTOOL
    configure:5242: error: possibly undefined macro: AC_DISABLE_STATIC
    configure:5246: error: possibly undefined macro: AC_ENABLE_STATIC

    and this (well, I used brew install libtool) fixed it for me. I was in for hours more frustration without you!

  34. on 25 May 2012 at 9:36 pm Rosana

    you rock!

  35. on 14 Jun 2012 at 5:46 pm kunal

    Thanks. Your post helped me fix my build issue.

  36. on 20 Aug 2012 at 2:43 pm dan

    Thank you!

  37. on 22 Oct 2012 at 12:04 pm eliafino

    Thank you very much!

  38. on 12 Mar 2013 at 10:38 am Akung

    Thank you,,, its very helpfull

  39. on 16 May 2013 at 8:54 pm Dr Von Braun

    Nicely done! :-)

  40. on 30 May 2013 at 5:51 pm ju

    still working ! (installing gift and apollon)

  41. on 11 Sep 2013 at 9:35 am Carlos

    You just saved me hours of figuring out what was going on.

    I appreciate it!!

  42. on 17 Sep 2014 at 7:12 am dali

    Thanks it resolved the problem

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  44. on 06 Nov 2014 at 9:40 am David

    Many thanks – Hadoop is a pig of a java program.

  45. on 12 Nov 2014 at 3:31 pm Jerry

    Thanks! Works!

  46. on 12 Nov 2014 at 7:41 pm Slawek Ksiazek

    it works, thx a lot :)

  47. on 19 Feb 2015 at 11:56 am Predrag Mandic

    Thanks a lot for this post! I had a problem unrelated to faad2, but with same error and it helped me build ZFS with SPL on Centos.

  48. on 28 Feb 2015 at 12:30 am DW

    Thanks! Still helpful 7 years later, haha!

  49. on 10 Nov 2015 at 3:39 pm me

    not working for me, I already have libtool installed

    ubuntu 15

  50. on 08 Dec 2015 at 5:38 am hamza

    how solve this ,please help me.

  51. on 15 Apr 2016 at 9:57 am Fei

    Thanks so much.you saved me also

  52. on 21 Apr 2016 at 9:00 am Alfort

    thank you very mutch

  53. on 02 May 2016 at 1:45 pm Rabiul

    worked fine, thanks.

  54. on 14 May 2016 at 8:10 am konrad


    This has worked for me too.

    I was compiling qemu under Linux Mint.

    Thanks a lot

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