mozjpeg-install-debian

sudo su
apt-get install -y autoconf automake libtool nasm make pkg-config
cd /tmp
wget https://github.com/mozilla/mozjpeg/releases/download/v3.1/mozjpeg-3.1-release-source.tar.gz
tar -xvf mozjpeg-3.1-release-source.tar.gz
cd mozjpeg
autoreconf -fiv
mkdir build && cd build
sh ../configure
make install
ln -s /opt/libmozjpeg/bin/jpegtran /usr/local/bin/mozjpeg

maybe necessary to install pkg-config

apt-get install pkg-config

I confirm I had also to add pkg-config

I had to use
ln -s /opt/mozjpeg/bin/jpegtran /usr/bin/mozjpeg

I know it's obvious but «gcc» or «clang» is mandatory.
In my case, i needed :
export LIBRARY_PATH=/usr/lib/x86_64-linux-gnu

Another thing, «/tmp» is sometime mounted with «noexec» option (security reason) so it's better to do that in other directory, otherwise the «configure» step fail.

«make deb» produce an .deb, who can be cleaner to install/uninstall on system.

I belive its really bad idea to compile programs under root user. It might be better to minimize sudo commands, i.e.:

sudo apt-get install -y autoconf automake libtool nasm make pkg-config
cd /tmp
wget https://github.com/mozilla/mozjpeg/releases/download/v3.1/mozjpeg-3.1-release-source.tar.gz
tar -xvf mozjpeg-3.1-release-source.tar.gz
cd mozjpeg
autoreconf -fiv
mkdir build && cd build
sh ../configure
make
sudo make install
sudo ln -s /opt/mozjpeg/bin/jpegtran /usr/local/bin/mozjpeg

If anyone is looking for V4, please check this:https://gist.github.com/vikas5914/4affccdfa5c3a722808cd465f77866b9