[FFmpeg-user] Regarding libmp3lame ......... error

[tank pranav]

Hi,

I am trying to utilize lame to increase the volume of any mp3 file using following command.
ffmpeg  -i   a_aud.mp3  -vol   512    -acodec    libmp3lame    output.mp3


but it was giving error ............ that .........
unrecognized encoder libmp3lame.


Then I tried to reconfigure "ffmpeg-0.11.2" using following command ..........
./configure --enable-libmp3lame  --disable-yasm


but ffmpeg gave following error......
ERROR: libmp3lame >= 3.99.3 not found


How should I resolve this error.

IF you have any idea about how to resolve this error then pls suggest me. 

Regards,
Pranav.