diff --git a/Makefile b/Makefile
index 44787be..0cb28be 100644
--- a/Makefile
+++ b/Makefile
@@ -44,19 +44,14 @@ CC        = gcc
 CXX       = g++
 WARNINGS  = -Wall -Wextra -pedantic
 
-# Pi3 CFLAGS
-CFLAGS    = $(WARNINGS) -I. -I./raylib -I/opt/vc/include/ -march=armv8-a -mfloat-abi=hard -mfpu=neon-fp-armv8 -O3 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -lstdc++ $(ACFLAGS)
-# Pi4 CFLAGS
-#CFLAGS    = $(WARNINGS) -DRPI4_TEST -I. -I./raylib_pi4_test -I/opt/vc/include/ -march=armv8-a -mfloat-abi=hard -mfpu=neon-fp-armv8 -O3 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -lstdc++ $(ACFLAGS)
-
-# Old SDL2 stuff
-#LFLAGS    = $(WARNINGS) `sdl2-config --libs`
-
 ifeq ($(PLATFORM),PI3_BULLSEYE)
-    LFLAGS    = $(WARNINGS) -L/usr/local/lib -L/opt/vc/lib -L./raylib_drm -lraylib -lGLESv2 -lEGL -lgbm -ldrm -ldl -lstdc++ -lvcos -lvchiq_arm -lvchostif -lasound
+	LFLAGS    = $(WARNINGS) -L/usr/local/lib -L/opt/vc/lib -L./raylib_drm -lraylib -lGLESv2 -lEGL -lgbm -ldrm -ldl -lstdc++ -lvcos -lvchiq_arm -lvchostif -lasound
+	CFLAGS    = $(WARNINGS) -I. -I./raylib -I/opt/vc/include/ -march=armv8-a -mfloat-abi=hard -mfpu=neon-fp-armv8 -O3 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -lstdc++ $(ACFLAGS)
 else ifeq ($(PLATFORM),PI4)
 	LFLAGS    = $(WARNINGS) -L/usr/local/lib -L/opt/vc/lib -L./raylib_pi4_test -lraylib -lGLESv2 -lEGL -lgbm -ldrm -ldl -lstdc++ -lvcos -lvchiq_arm -lvchostif -lasound
+	CFLAGS    = $(WARNINGS) -DRPI4_TEST -I. -I./raylib_pi4_test -I/opt/vc/include/ -march=armv8-a -mfloat-abi=hard -mfpu=neon-fp-armv8 -O3 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -lstdc++ $(ACFLAGS)
 else
+	CFLAGS    = $(WARNINGS) -I. -I./raylib -I/opt/vc/include/ -march=armv8-a -mfloat-abi=hard -mfpu=neon-fp-armv8 -O3 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -lstdc++ $(ACFLAGS)
 	LFLAGS    = $(WARNINGS) -L/opt/vc/lib -L./raylib -lraylib -lbrcmGLESv2 -lbrcmEGL -lbcm_host -lstdc++ -lvcos -lvchiq_arm -lasound
 endif
 
diff --git a/README.md b/README.md
index a4a5254..cda7672 100644
--- a/README.md
+++ b/README.md
@@ -72,7 +72,8 @@ Now the final steps to get things up and running, all of this is done from a com
 * `git clone https://github.com/captain-amygdala/pistorm.git`
 * `cd pistorm`
 * `make`
-**Important note:** If you are using Raspberry Pi OS "Bullseye', you need to run `make PLATFORM=PI3_BULLSEYE` for the emulator to compile successfully since the main graphics backend has changed from dispmanx to DRM.
+**Important note:** If you are using **Raspberry Pi OS "Bullseye'**, you need to run `make PLATFORM=PI3_BULLSEYE` for the emulator to compile successfully since the main graphics backend has changed from dispmanx to DRM.  
+In addition, you also need to run `sudo apt-get install libdrm-dev libegl1-mesa-dev libgles2-mesa-dev libgbm-dev`, as the DRM OpenGL/ES libraries are for some reason not included with the distro by default.
 
 Next up, follow the steps for installing the FPGA bitstream update below. (Scroll down.)