Build libass with MacOS

  1. Install the prerequisites:
    brew install freetype fribidi nasm pkg-config libtool
  2. Run command glibtoolize, otherwise you will get the error: Libtool library used but 'LIBTOOL' is undefined
  3. Do the common build process:
    ./autogen.sh
    ./configure --prefix=/outdirectory
    make
    make install