Help setting up Forge with Eclipse IDE

[The Great Duck]

I have been following this tutorial (currently at step 3): http://www.minecraftforge.net/wiki/Installation/Source

 

I entered the command prompt properly and it began running. It got to "make start" in the series of what appear to be steps within the command prompt, and then failed with this error:

 

"unable to find javac compiler;"

"com.sun.tools.javac.Main is not on the classpath."

"Perhaps JAVA_HOME does not point to the JDK."

"It is currently set to 'C:\Program Files\Java\jre1.8.0_25'"

 

I went into the environment variables within my PC (windows 7) and was unable to find one named "JAVA_HOME". Changing the section of my PATH variable relating to the java sdk does not appear to have any effect on "JAVA_HOME". I'm not entirely sure what the issue with this is. It appears to be some sort of variable I need to access and change to the proper directory. The problem is that I don't know /where/ to change JAVA_HOME, or if I even can manually. I would very much appreciate help, thank you.

[The Great Duck]

Thank you. It has now passed that step. I will let you know if anything else occurs. I'm waiting for it to run as I type.