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i wanted to install ffmpeg with lame mp3 support.its procedure is as follows:

cd /usr/local/src/ffmpeg/
./configure –enable-libmp3lame –enable-libogg –enable-libvorbis 
make && make install

but i have not passed -enable-libmp3lame during installing to ./configure so mp3lame support is not can i modify existing installation to install libmp3

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You can't modify it without recompile. You have to run configure and make again with correct switches.

make install will then overwrite current versions of your ffmpeg with correct one.

Disclaimer: yes, you can patch binary files, but that's not practical in any sense in this case.

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