GWT 2.6 - JDK 1.6?

Hello,

GWT GIT: git clone https://gwt.googlesource.com/gwt
 
I downloaded the source GWT 2.6 but in the readme file write

"Window-> Preferences-> Java-> Build Path-> Classpath Variables
Create a variable named "GWT_TOOLS" pointing to your "tools" folder.
Create a variable named "JDK_HOME" pointing to the root of your JDK install
   (for example, C: \ Program Files \ JDK1.6 or /usr/lib/j2sdk1.6-sun) "

Is to compile this version I have versions of JDK 1.6?

Regards,
ŁB