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/vim/recipe.toml

@@ -0,0 +1,26 @@
+[source]
+tar = "https://github.com/vim/vim/archive/refs/tags/v9.1.0821.tar.gz"
+blake3 = "d1f5802ceb047b09143f1764bf4016f084cf7e6c026c7047919264c9f262a5dd"
+patches = ["vim.patch"]
+
+[build]
+dependencies = ["ncursesw"]
+template = "custom"
+script = """
+DYNAMIC_INIT
+rsync -av --delete "${COOKBOOK_SOURCE}/" ./
+
+export vim_cv_toupper_broken=no
+export vim_cv_tgetent=zero
+export vim_cv_terminfo=yes
+export vim_cv_tty_group=world
+export vim_cv_getcwd_broken=no
+export vim_cv_stat_ignores_slash=yes
+export vim_cv_memmove_handles_overlap=yes
+
+COOKBOOK_CONFIGURE="./configure"
+COOKBOOK_CONFIGURE_FLAGS+=(
+    --with-tlib=ncursesw
+)
+cookbook_configure
+"""

recipes/tools/vim/vim.patch

@@ -0,0 +1,66 @@
+diff -ruwN source/src/configure.ac source-new/src/configure.ac
+--- source/src/configure.ac	2024-10-29 04:05:26.000000000 +0700
++++ source-new/src/configure.ac	2025-08-06 03:15:52.796303989 +0700
+@@ -3759,7 +3759,7 @@
+ dnl Check for functions in one big call, to reduce the size of configure.
+ dnl Can only be used for functions that do not require any include.
+ AC_CHECK_FUNCS(fchdir fchown fchmod fsync getcwd getpseudotty \
+-	getpwent getpwnam getpwuid getrlimit gettimeofday localtime_r lstat \
++	getpwent getpwnam getpwuid gettimeofday localtime_r lstat \
+ 	memset mkdtemp nanosleep opendir putenv qsort readlink select setenv \
+ 	getpgid setpgid setsid sigaltstack sigstack sigset sigsetjmp sigaction \
+ 	sigprocmask sigvec strcasecmp strcoll strerror strftime stricmp strncasecmp \
+diff -ruwN source/src/feature.h source-new/src/feature.h
+--- source/src/feature.h	2024-10-29 04:05:26.000000000 +0700
++++ source-new/src/feature.h	2025-08-06 03:16:27.596296730 +0700
+@@ -272,6 +272,7 @@
+  */
+ #if defined(FEAT_NORMAL) \
+ 	&& defined(FEAT_EVAL) \
++	&& !defined (__redox__)  /* disable setitimer */ \
+ 	&& ((defined(HAVE_GETTIMEOFDAY) && defined(HAVE_SYS_TIME_H) \
+ 		&& (!defined(MACOS_X) || defined(HAVE_DISPATCH_DISPATCH_H))) \
+ 	    || defined(MSWIN))
+diff -ruwN source/src/libvterm/include/vterm.h source-new/src/libvterm/include/vterm.h
+--- source/src/libvterm/include/vterm.h	2024-10-29 04:05:26.000000000 +0700
++++ source-new/src/libvterm/include/vterm.h	2025-08-06 03:15:02.506316769 +0700
+@@ -17,9 +17,11 @@
+ #define FALSE 0
+ 
+ // VIM: from stdint.h
++#if !defined (__redox__)
+ typedef unsigned char		uint8_t;
+ typedef unsigned short		uint16_t;
+ typedef unsigned int		uint32_t;
++#endif
+ 
+ // VIM: define max screen cols and rows
+ #define VTERM_MAX_COLS 1000
+diff -ruwN source/src/memfile.c source-new/src/memfile.c
+--- source/src/memfile.c	2024-10-29 04:05:26.000000000 +0700
++++ source-new/src/memfile.c	2025-08-06 03:15:36.896308173 +0700
+@@ -599,6 +599,8 @@
+ 	    // No sync() on Stratus VOS
+ # if defined(__OPENNT) || defined(__TANDEM) || defined(__VOS__)
+ 	    fflush(NULL);
++# elif defined(__redox__)
++        fsync(mfp->mf_fd);
+ # else
+ 	    sync();
+ # endif
+diff -ruwN source/src/auto/configure source-new/src/auto/configure
+--- source/src/auto/configure	2024-10-29 04:05:26.000000000 +0700
++++ source-new/src/auto/configure	2025-08-06 03:56:11.765660165 +0700
+@@ -13358,12 +13358,6 @@
+   printf "%s\n" "#define HAVE_GETPWUID 1" >>confdefs.h
+ 
+ fi
+-ac_fn_c_check_func "$LINENO" "getrlimit" "ac_cv_func_getrlimit"
+-if test "x$ac_cv_func_getrlimit" = xyes
+-then :
+-  printf "%s\n" "#define HAVE_GETRLIMIT 1" >>confdefs.h
+-
+-fi
+ ac_fn_c_check_func "$LINENO" "gettimeofday" "ac_cv_func_gettimeofday"
+ if test "x$ac_cv_func_gettimeofday" = xyes
+ then :