The options --enable-libamr-nb --enable-libamr-wb which are recommended on this page http://www.kdenlive.org/user-manual/downloading-and-installing-kdenlive/... don't work anymore.
Quote from ffmpeg.org:
July 24, 2009
FFmpeg has removed support for libamr as of svn revision 19365. It has been replaced with support for libopencore-amr. Naturally the configure options have changed. The libamr options have been removed and there are two new options to take their place:
The reason for this change is that the libamr license was non-free, while libopencore-amr is licensed under an Apache 2 license. The change was discussed at length on the developer mailing list during May, June, and July. This has several effects:
* You may now distribute FFmpeg builds with support for dynamically loading libopencore-amr
* Support for AMR-WB encoding has been removed since libopencore-amr does not support it