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/dev/luajit/recipe.toml

@@ -0,0 +1,22 @@
+[source]
+git = "https://luajit.org/git/luajit.git"
+rev = "a4f56a459a588ae768801074b46ba0adcfb49eb1"
+patches = ["redox.patch"]
+[build]
+template = "custom"
+script = """
+DYNAMIC_INIT
+
+rsync -av "${COOKBOOK_SOURCE}/" ./
+OS=$(echo "${TARGET}" | cut -d - -f3)
+
+case "${OS}" in
+    linux)  SYS=Linux;;
+    redox)  SYS=Redox;;
+esac
+
+${COOKBOOK_MAKE} -j ${COOKBOOK_MAKE_JOBS} install \
+  PREFIX="${COOKBOOK_STAGE}" \
+  TARGET_SYS="${SYS}" \
+  CROSS="${GNU_TARGET}-"
+"""

recipes/dev/luajit/redox.patch

@@ -0,0 +1,31 @@
+diff --git a/src/Makefile b/src/Makefile
+index 3a6a4329..450e8fe6 100644
+--- a/src/Makefile
++++ b/src/Makefile
+@@ -351,6 +351,9 @@ else
+   ifeq (GNU/kFreeBSD,$(TARGET_SYS))
+     TARGET_XLIBS+= -ldl
+   endif
++  ifeq (Redox,$(TARGET_SYS))
++    TARGET_XCFLAGS+= -DLUAJIT_OS=LUAJIT_OS_POSIX
++  endif
+ endif
+ endif
+ endif
+@@ -367,12 +370,16 @@ ifneq ($(HOST_SYS),$(TARGET_SYS))
+   else
+   ifeq (iOS,$(TARGET_SYS))
+     HOST_XCFLAGS+= -DLUAJIT_OS=LUAJIT_OS_OSX -DTARGET_OS_IPHONE=1
++  else
++  ifeq (Redox,$(TARGET_SYS))
++    HOST_XCFLAGS+= -DLUAJIT_OS=LUAJIT_OS_POSIX
+   else
+     HOST_XCFLAGS+= -DLUAJIT_OS=LUAJIT_OS_OTHER
+   endif
+   endif
+   endif
+   endif
++  endif
+ endif
+ 
+ ifneq (,$(CCDEBUG))