jpeg 编译

cd $jpegdir ## the real jpeg source dir

./configure --prefix=$youwantdir --enable-shared

make install

## bakup old

cd /usr/lib

mv libjpeg.so.62.0.0 back.libjpeg.so.62.0.0

cd $yourwantdir

cp libjpeg.so.62.0.0 /usr/lib/