Command explanations : This switch is used to avoid the configuration routine asking for confirmation of the installation directories (which we pass to configure). --with-DIR_MAN=/usr/share/man: This is used because despite the fact we pass --prefix=/usr, the configure routine tries to install the man pages in /usr/local/man instead of the correct place. --with-ZIP=yes --with-DIR_GZLIB=/usr/lib: This enables support for the handling of TIFF images with deflate-encoded data. --with-JPEG=yes --with-DIR_JPEGLIB=/usr/lib: Use these switches to enable support for the handling of TIFF images with JPEG-encoded data.