Readme: add GL/glu.h dependency ubuntu 24.04

README.md

@@ -14,14 +14,14 @@ Here's the dependencies that you install in order to compile all the libraries:
 
 * fmt: libpng-dev libturbojpeg-dev libvorbis-dev
 * openal: libopenal-dev
-* sdl: libsdl2-dev
+* sdl: libsdl2-dev libglu1-mesa-dev
 * ssl: libmbedtls-dev
 * uv: libuv1-dev
 * sqlite: libsqlite3-dev
 
 To install all dependencies on the latest **Ubuntu**, for example:
 
-`sudo apt-get install libpng-dev libturbojpeg-dev libvorbis-dev libopenal-dev libsdl2-dev libmbedtls-dev libuv1-dev libsqlite3-dev`
+`sudo apt-get install libpng-dev libturbojpeg-dev libvorbis-dev libopenal-dev libsdl2-dev libglu1-mesa-dev libmbedtls-dev libuv1-dev libsqlite3-dev`
 
 For 16.04, see [this note](https://github.com/HaxeFoundation/hashlink/issues/147).