So, I've been working on updating a handful of mods from 1.10.2 to 1.11.2, CodeChickenLib included (although I noticed that it's already updated, after I started the process, durr...). Admittedly, this is my first experience with Java (I mainly code in Python and C++), let alone Minecraft modding, so I'm probably missing something really simple along the way. However, I've noticed that a lot of classes in CCL reference private class members from Minecraft itself, and as such I'm unable to compile the mods error-free. I'm stuck on codechicken.lib.render.state.GlStateManagerHelper, where it seems that everything references private members and functions belonging to GlStateManager.

Bottom line, there has to be some important differences I'm missing between the compiler settings I have vs. the compiler settings used to create the official 1.11.2 release. I want to know, what am I doing wrong?

Minecraft: 1.11.2
JRE: jre1.8.0_60 / jre1.8.0_121
Compiler Compliance Level: 1.8
Forge: 1.11.2-13.20.0.2260
IDE: Eclipse Java Neon (macOS/Windows)
Added buildscript repository: http://files.minecraftforge.net/maven (Gradle fails to obtain fernflower:2.0-SNAPSHOT without it)

I figured out what it was that caused all the issues: it turns out that Forge 13.20.0.2252 is the required version, and updating to 2260 messed everything up. Oops!