To have a server without Xorg, Xfce and all GUI programs just remove the whole /opt directory. Some software like the graphic libraries (jpeg, png, gif, tiff) are installed in /opt. Just reinstall them to /usr. The compile scripts are already included in the archive.
You find the additional server program source codes in the 50-server/ directory.
01-stuff/ 02-image-libs-USR/ 20-mail/ 30-mysql/ 40-http/ 45-php/ 50-gpg/ 70-clamspam/
Every directory has compile scripts to easily compile and install the programs. For detail information about compile scripts read the build tools Sources and Compile Scripts section.
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