Here is my solution for installing the JCL and JVCL latest Project Jedi code from the GIT repository, thus to get XE5 support until binary installers are readily available. This solution may be of use to others when (say) XE6 comes along....
Using TortoiseSVN, checkout the two JEDI GIT repositories so that you have a common root folder Jedi and the two checkouts are subfolders of it 'Jcl' and 'Jvcl'. The two checkouts are:
Into Jvcl folder: "https://github.com/project-jedi/jvcl/trunk/jvcl"
Into Jcl folder: https://github.com/project-jedi/jcl/trunk/jcl"
You should arrange for the common root folder 'jedi' to be in your program files folder, e.g. 'c:\program files (x86)'
Now checkout the JEDI.INC file which you will need for XE5 but checking out from:
"https://github.com/project-jedi/jedi"
You will see a file 'jedi.inc' in this checkout. Place it into a new folder 'jedi' in the '...jcl\source\include' folder.
Now go to the jedi\jcl folder and right-click 'install.bat' using 'Run as administrator'. After answering the prompts this should install the jcl.
Now go to the jedi\jvcl folder and right-click 'install.bat' using 'Run as administrator'. After answering the prompts this should install the jvcl too.