Unknown encoder 'libx264' .I am using x264 and fdk-aac with avconv from libav

Unknown encoder 'libx264' .I am using x264 and fdk-aac with avconv from libav

I did the following 1.) Make a directory avconv-source
mkdir avconv-source
2.) Download and install the x264 library
cd ~/avconv-source git clone git://git.videolan.org/x264.git x264 cd x264 sudo ./configure --enable-static sudo make sudo make install
3.) Download the avconv source
cd ~/avconv-source git clone git://git.libav.org/libav.git avconv cd avconv sudo ./configure sudo ./configure --enable-gpl --enable-libx264 sudo make sudo make install