diff --git a/linux-rasp-pi4-X11-EGLFS.md b/linux-rasp-pi4-X11-EGLFS.md
index f9a058e..d030b9e 100644
--- a/linux-rasp-pi4-X11-EGLFS.md
+++ b/linux-rasp-pi4-X11-EGLFS.md
@@ -3,6 +3,7 @@
 // RPI4 OpenGL Support
 ```
 apt-get install libgles2-mesa-dev
+sudo apt install libgbm-dev libdrm-dev
 apt-get install xorg-dev
 ```