diff --git a/docs/building.md b/docs/building.md
index 792da737b..843787d6d 100644
--- a/docs/building.md
+++ b/docs/building.md
@@ -88,18 +88,24 @@ get helpful spacers/movs in the disassembly.
 
 Linux support is extremely experimental and presently incomplete.
 
-The build script uses LLVM/Clang 19. GCC while it should work in theory, is not easily
+The build script uses Clang 19. GCC while it should work in theory, is not easily
 interchangeable right now.
 
 * Normal building via `xb build` uses CMake+Ninja.
-* [CodeLite](https://codelite.org) is supported. `xb devenv` will generate a workspace and attempt to open it. Your distribution's version may be out of date so check their website.
-* Experimental CMake generation is available to facilitate use of other IDEs such as [CLion](https://www.jetbrains.com/clion/). If `clion` is available inside `$PATH`, `xb devenv` will start it. Otherwise `build/CMakeLists.txt` needs to be generated by invoking `xb premake --devenv=cmake` manually.
+* Environment variables:
+  Name  | Default Value
+  ----- | -------------
+  `CC`  | `clang`
+  `CXX` | `clang++`
+
+<!--* [CodeLite](https://codelite.org) is supported. `xb devenv` will generate a workspace and attempt to open it. Your distribution's version may be out of date so check their website.
+* Experimental CMake generation is available to facilitate use of other IDEs such as [CLion](https://www.jetbrains.com/clion/). If `clion` is available inside `$PATH`, `xb devenv` will start it. Otherwise `build/CMakeLists.txt` needs to be generated by invoking `xb premake --devenv=cmake` manually.-->
 
 Clang-19 or newer should be available from system repositories on all up to date distributions.
 You will also need some development libraries. To get them on an Ubuntu system:
 
 ```sh
-sudo apt-get install mesa-vulkan-drivers valgrind libc++-dev libc++abi-dev libgtk-3-dev libsdl2-dev libvulkan-dev libx11-xcb-dev clang-19 llvm-19 ninja-build
+sudo apt-get install build-essential mesa-vulkan-drivers valgrind libc++-dev libc++abi-dev libgtk-3-dev liblz4-dev libsdl2-dev libvulkan-dev libx11-xcb-dev clang-19 llvm-19 ninja-build
 ```
 
 In addition, you will need up to date Vulkan libraries and drivers for your hardware, which most distributions have in their standard repositories nowadays.