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/tools/schismtracker/recipe.toml

@@ -0,0 +1,28 @@
+[source]
+tar = "https://github.com/schismtracker/schismtracker/archive/20181223.tar.gz"
+blake3 = "057e973f4f84cf898e2240d67c0e92f25086d8b9ffdc7e0c7ef81dd8dc81bc70"
+patches = ["redox.patch"]
+script = """
+autoreconf -i
+"""
+
+[build]
+template = "custom"
+dependencies = [
+    "sdl1",
+    "liborbital", 
+    "libiconv",
+]
+script = """
+export CFLAGS="${CFLAGS} -I${COOKBOOK_SYSROOT}/include/SDL"
+export SDL_CONFIG="${COOKBOOK_SYSROOT}/bin/sdl-config"
+
+COOKBOOK_CONFIGURE_FLAGS=(
+    --build="$(gcc -dumpmachine)"
+    --host="${TARGET}"
+    --prefix=""
+    --with-sdl-prefix="${COOKBOOK_SYSROOT}"
+)
+
+cookbook_configure
+"""

recipes/tools/schismtracker/redox.patch

@@ -0,0 +1,24 @@
+diff -rupNw source-original/Makefile.am source/Makefile.am
+--- source-original/Makefile.am	2018-08-10 07:04:54.000000000 +0200
++++ source/Makefile.am	2018-12-30 23:18:07.957244170 +0100
+@@ -223,7 +223,7 @@ files_macosx = \
+ endif
+ 
+ if USE_NETWORK
+-cflags_network=-DUSE_NETWORK
++#cflags_network=-DUSE_NETWORK
+ endif
+ 
+ 
+diff -rupNw source-original/schism/main.c source/schism/main.c
+--- source-original/schism/main.c	2018-08-10 07:04:54.000000000 +0200
++++ source/schism/main.c	2018-12-30 23:19:24.954046191 +0100
+@@ -1033,7 +1033,7 @@ int main(int argc, char **argv)
+ 
+ 	video_fullscreen(0);
+ 
+-	tzset(); // localtime_r wants this
++	//tzset(); // localtime_r wants this
+ 	srand(time(NULL));
+ 	parse_options(argc, argv); /* shouldn't this be like, first? */
+