Red Bear OS — microkernel OS in Rust, based on Redox

Derivative of Redox OS (https://www.redox-os.org) adding:
- AMD GPU driver (amdgpu) via LinuxKPI compat layer
- ext4 filesystem support (ext4d scheme daemon)
- ACPI fixes for AMD bare metal (x2APIC, DMAR, IVRS, MCFG)
- Custom branding (hostname, os-release, boot identity)

Build system is full upstream Redox with RBOS overlay in local/.
Patches for kernel, base, and relibc are symlinked from local/patches/
and protected from make clean/distclean. Custom recipes live in
local/recipes/ with symlinks into the recipes/ search path.

Build:  make all CONFIG_NAME=redbear-full
Sync:   ./local/scripts/sync-upstream.sh

recipes/wip/demos/rust-cairo-demo/recipe.sh

@@ -0,0 +1,18 @@
+GIT=https://gitlab.redox-os.org/redox-os/rust-cairo-demo.git
+BUILD_DEPENDS=(cairo expat fontconfig freetype2 libpng pixman zlib)
+
+function recipe_build {
+    sysroot="$(realpath ../sysroot)"
+    cargo rustc --target "$TARGET" --release ${CARGOFLAGS} \
+        -- \
+        -L "${sysroot}/lib" \
+        -l cairo \
+        -l fontconfig \
+        -l expat \
+    	-l pixman-1 \
+    	-l freetype \
+    	-l png \
+    	-l z
+    skip=1
+}
+