title: Libtool library used but `LIBTOOL' is undefined?
body: <p>Im trying to install ffmpeg on my server. Im unsing centos 5.</p>
  
  <p>When I try to install libfdk_aac I get the following error</p>
  
  <pre><code>` autoreconf: Entering directory `.'
  autoreconf: configure.ac: not using Gettext
  autoreconf: running: aclocal --force -I m4
  autoreconf: configure.ac: tracing
  autoreconf: configure.ac: not using Libtool
  autoreconf: running: /usr/bin/autoconf --force
  autoreconf: configure.ac: not using Autoheader
  autoreconf: running: automake --add-missing --copy --force-missing
  Makefile.am:31: Libtool library used but `LIBTOOL' is undefined
  Makefile.am:31:
  Makefile.am:31: The usual way to define `LIBTOOL' is to add `AC_PROG_LIBTOOL'
  Makefile.am:31: to `configure.ac' and run `aclocal' and `autoconf' again.
  Makefile.am: C objects in subdir but `AM_PROG_CC_C_O' not in `configure.ac'
  autoreconf: automake failed with exit status: 1 ` 
  </code></pre>
  
  <p>If i type which libtool I get /usr/bin/libtool, so i think libtool is installed.
  So im not sure why this error is happening.</p>
  
  <p>Thanks for any advice</p>