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/games/sopwith/recipe.toml

@@ -0,0 +1,31 @@
+[source]
+tar = "https://github.com/fragglet/sdl-sopwith/releases/download/sdl-sopwith-1.8.4/sopwith-1.8.4.tar.gz"
+blake3 = "44e1404a9c4bea257d7778d2a4b1512231603a74b0a7b18eac5d18f36730ed3e"
+
+[build]
+template = "custom"
+dependencies = [
+    "sdl1",
+    "liborbital",
+    "libiconv",
+]
+script = """
+export CFLAGS="${CFLAGS} -I${COOKBOOK_SYSROOT}/include/SDL"
+export LIBS="-lSDL -lorbital" # TODO: Uses sdl-config instead of pkg-config
+
+# For some reason, cook_configure breaks spectacularly on this
+# We will just copy instead
+rsync -av --delete "${COOKBOOK_SOURCE}/" ./
+
+wget -O autotools/config.sub "https://gitlab.redox-os.org/redox-os/gnu-config/-/raw/master/config.sub?inline=false"
+
+./configure \\
+    --build="$(gcc -dumpmachine)" \\
+    --host="${TARGET}" \\
+    --prefix="" \\
+    --with-sdl-prefix="${COOKBOOK_SYSROOT}"
+
+make -j"$(nproc)"
+
+make DESTDIR="${COOKBOOK_STAGE}" install
+"""