Somebody else had this same issue (http://www.minecraftforge.net/forum/index.php?topic=17247.0), but they were not given what appears to be any useful advice.

 

Here is my log:

 

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Searge, ProfMobius, Fesh0r,

R4wk, ZeuX, IngisKahn     

MCP Data version : unknown

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:downloadMcpTools UP-TO-DATE

:extractUserDev

:genSrgs UP-TO-DATE

:downloadClient SKIPPED

:downloadServer SKIPPED

:mergeJars SKIPPED

:deobfuscateJar UP-TO-DATE

:decompile SKIPPED

:doFmlPatches SKIPPED

:addFmlSources UP-TO-DATE

:remapJar SKIPPED

:doForgePatches

Patching failed: net/minecraft/client/renderer/RenderBlocks.java Cannot find hunk target

Hunk 6 failed! Cannot find hunk target

Hunk 10 failed! Cannot find hunk target

Patching failed: net/minecraft/client/renderer/entity/RenderItem.java Cannot find hunk target

Hunk 11 failed! Cannot find hunk target

Hunk 12 failed! Cannot find hunk target

:doForgePatches FAILED

 

FAILURE: Build failed with an exception.

 

* What went wrong:

Execution failed for task ':doForgePatches'.

> Could not call EditJarTask.doTask() on task ':doForgePatches'

 

Anybody know how to fix this?

If you're using Java 8, don't. Otherwise, I would say delete your .gradle folder in your user directory (/Users/xxx/.gradle), and try everything again.

I'm not running Java 8. I could just be a complete dufus if this is the case--I don't have a .gradle folder, do I have to download gradle somewhere? It didn't say that anywhere on the getting started page.

It's added when you run gradlew for the first time. Did you run (assuming you're on Windows):

gradlew.bat setupDecompWorkspace