I build datapack normally but when i try to build core i have this :

 

the 1st issue is because you have no svn client installed to fix this install sliksvn commandline client.

 

the 2nd issue is because you have no jdk installed and you didnt set it up properly(or you did but your eclipse doesnt use it).

i installed sliksvn commandline client and i reinstall jdk now i have this:

 

i installed sliksvn commandline client and i reinstall jdk now i have this:

 

 

you didnt configured your java jdk at all and the sliksvn issue well i dont know your build.xml may be outdated as far as the versionning part goes if it annoys you you can just delete the versionning its useless anyway

i installed sliksvn commandline client and i reinstall jdk now i have this:

 

 

and you didnt set it up properly(or you did but your eclipse doesnt use it).

 

http://i.imgur.com/XyhNcTc.png[/img]

I solved the previous problem and now this came out: