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/emulators/mgba/recipe.toml

@@ -0,0 +1,18 @@
+[source]
+tar = "https://github.com/mgba-emu/mgba/archive/0.10.5.tar.gz"
+blake3 = "a1b9e797a5058f5264d276805aef5643b7ea460916e491a0098ba32d87f1519e"
+patches = ["redox.patch"]
+
+[build]
+dependencies = ["libiconv", "liborbital", "libpng", "pixman", "sdl1", "zlib"]
+template = "cmake"
+cmakeflags = [
+    "-DBUILD_QT=OFF",
+    "-DBUILD_SHARED=ON",
+    "-DBUILD_STATIC=OFF",
+    "-DUSE_SQLITE3=OFF",
+    "-DUSE_DEBUGGERS=OFF",
+    "-DBUILD_SDL=ON",
+    "-DSDL_VERSION=1.2",
+    "-DSDL_LIBRARY=-lSDL -lorbital",
+]

recipes/emulators/mgba/redox.patch

@@ -0,0 +1,12 @@
+diff -ruwN mgba-0.10.5/src/third-party/zlib/contrib/minizip/ioapi.h source/src/third-party/zlib/contrib/minizip/ioapi.h
+--- mgba-0.10.5/src/third-party/zlib/contrib/minizip/ioapi.h	2025-03-08 20:09:26.000000000 -0700
++++ source/src/third-party/zlib/contrib/minizip/ioapi.h	2025-06-13 13:07:13.489517096 -0600
+@@ -50,7 +50,7 @@
+ #define ftello64 ftell
+ #define fseeko64 fseek
+ #else
+-#ifdef __FreeBSD__
++#if defined(__FreeBSD__) || defined(__redox__)
+ #define fopen64 fopen
+ #define ftello64 ftello
+ #define fseeko64 fseeko