When working with Image optimisation script when asked to install
optipng, make sure your package managing tool installs latest version. Because you might run into problems, where permissions after file is optimized are being dropped.
To install latest version of
jpegoptim go to this page and download the latest source.
Then go to this page and follow installation instructions
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zcat jpegoptim-1.4.4.tar.gz | tar xf - cd jpegoptim-1.4.4 ./configure make make strip make install
If you have previously installed jpegoptim, you need to remove it, and check if version is the latest one after installing from source by calliing
jpegoptim --help. If not type
which jpegoptim to figure out the path to it, and symlink it to correct location.