diff --git a/CMakeLists.txt b/CMakeLists.txt
index 27386aa8..6907d09d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,6 +12,7 @@ set(OPENTS_VERSION_PRERELEASE "")
 option(OPENTS_OFFICIAL_BUILD "Build as an official release of the declared version" OFF)
 
 option(OPENTS_EXPERIMENTAL_CLANG_CL "Build with clang-cl using the MSVC ABI" OFF)
+option(OPENTS_EXPERIMENTAL_NATIVE "Configure a native build for the host platform" OFF)
 
 if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang"
    AND CMAKE_CXX_COMPILER_FRONTEND_VARIANT STREQUAL "MSVC")
@@ -24,14 +25,24 @@ elseif(MSVC)
     if(MSVC_VERSION LESS 1930)
         message(FATAL_ERROR "OpenTS requires MSVC 19.30 or newer.")
     endif()
+elseif(OPENTS_EXPERIMENTAL_NATIVE)
+    message(STATUS "OpenTS: configuring an unsupported native build for the host platform.")
+
+    # The tree declares imports and exports with __declspec throughout, which clang only
+    # accepts with the Microsoft extensions enabled.
+    add_compile_options(-fms-extensions)
 else()
     message(FATAL_ERROR
         "OpenTS requires the Visual Studio 2022 MSVC toolchain. "
         "For the unsupported clang-cl experiment, configure with "
-        "-DCMAKE_TOOLCHAIN_FILE=cmake/toolchains/clang-cl-msvc.cmake.")
+        "-DCMAKE_TOOLCHAIN_FILE=cmake/toolchains/clang-cl-msvc.cmake. "
+        "For the unsupported native build, configure with "
+        "-DOPENTS_EXPERIMENTAL_NATIVE=ON.")
 endif()
 
-enable_language(RC)
+if(WIN32)
+    enable_language(RC)
+endif()
 
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
diff --git a/code/CMakeLists.txt b/code/CMakeLists.txt
index 94876c52..b350a8fb 100644
--- a/code/CMakeLists.txt
+++ b/code/CMakeLists.txt
@@ -2,7 +2,7 @@
 set(CMAKE_CONFIGURATION_TYPES Debug Release CACHE STRING "" FORCE)
 
 # OpenTS currently supports 32-bit (x86) builds only.
-if(NOT CMAKE_SIZEOF_VOID_P EQUAL 4)
+if(WIN32 AND NOT CMAKE_SIZEOF_VOID_P EQUAL 4)
     message(FATAL_ERROR "OpenTS must be built as 32-bit x86. Reconfigure with -A Win32.")
 endif()
 
@@ -165,7 +165,7 @@ set_source_files_properties("${CMAKE_CURRENT_SOURCE_DIR}/bgfxbackend.cpp" PROPER
         "${BGFX_ROOT}/include;${CMAKE_SOURCE_DIR}/thirdparty/bgfx.cmake/bx/include;${BGFX_ROOT}/examples/common/imgui"
     COMPILE_DEFINITIONS
         "BX_CONFIG_DEBUG=$<IF:$<CONFIG:Debug>,1,$<BOOL:${BX_CONFIG_DEBUG}>>"
-    COMPILE_OPTIONS "/Zc:preprocessor"
+    COMPILE_OPTIONS "$<$<BOOL:${MSVC}>:/Zc:preprocessor>"
 )
 
 # bx rewrites __stdcall while its headers are being parsed by clang-cl.  Force the
@@ -358,12 +358,14 @@ add_custom_command(TARGET OpenTS POST_BUILD
         "${TS_RUN_DIR}"
 )
 
-# Copy the linker-generated .pdb alongside the exe
-add_custom_command(TARGET OpenTS POST_BUILD
-    COMMAND ${CMAKE_COMMAND} -E copy_if_different
-        "$<TARGET_PDB_FILE:OpenTS>"
-        "${TS_RUN_DIR}"
-)
+# Copy the linker-generated .pdb alongside the exe. Only the MSVC linker writes one.
+if(MSVC)
+    add_custom_command(TARGET OpenTS POST_BUILD
+        COMMAND ${CMAKE_COMMAND} -E copy_if_different
+            "$<TARGET_PDB_FILE:OpenTS>"
+            "${TS_RUN_DIR}"
+    )
+endif()
 
 # Copy the linker-generated .map (sits next to the exe, no GenEx for it)
 add_custom_command(TARGET OpenTS POST_BUILD
diff --git a/code/addon.cpp b/code/addon.cpp
index fdeb7ea9..772f5527 100644
--- a/code/addon.cpp
+++ b/code/addon.cpp
@@ -14,7 +14,7 @@
 #include "ccfile.h"
 #include "data.h"
 #include "init.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "ownrdraw.h"
 
 BOOL CALLBACK Select_Game_Type_Dialog_Proc(HWND window, UINT message, WPARAM wparam, LPARAM lparam);
diff --git a/code/chat.cpp b/code/chat.cpp
index 659baf4c..10cec49b 100644
--- a/code/chat.cpp
+++ b/code/chat.cpp
@@ -19,7 +19,7 @@
 #include "globals.h"
 #include "house.h"
 #include "ipxmgr.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "rules.h"
 #include "session.h"
 #include "stimer.h"
diff --git a/code/conquer.cpp b/code/conquer.cpp
index fbfc034c..3227f44e 100644
--- a/code/conquer.cpp
+++ b/code/conquer.cpp
@@ -89,7 +89,7 @@
 #include "init.h"
 #include "ipxmgr.h"
 #include "keyboard.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "logic.h"
 #include "mainloop.h"
 #include "movie.h"
diff --git a/code/credits.cpp b/code/credits.cpp
index 5449b17d..5c709b1a 100644
--- a/code/credits.cpp
+++ b/code/credits.cpp
@@ -46,7 +46,7 @@
 #include "dsurface.h"
 #include "globals.h"
 #include "house.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "rules.h"
 #include "scenario.h"
 #include "scheme.h"
diff --git a/code/display.cpp b/code/display.cpp
index be765e85..f856fad3 100644
--- a/code/display.cpp
+++ b/code/display.cpp
@@ -124,7 +124,7 @@
 #include "inline.h"
 #include "isotype.h"
 #include "keyboard.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "logic.h"
 #include "mixfile.h"
 #include "overtype.h"
diff --git a/code/dropship.cpp b/code/dropship.cpp
index 7325650d..960b13d1 100644
--- a/code/dropship.cpp
+++ b/code/dropship.cpp
@@ -33,7 +33,7 @@
 #include "house.h"
 #include "infatype.h"
 #include "keyboard.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "misc.h"
 #include "mixfile.h"
 #include "mouse.h"
diff --git a/code/dsaudio.cpp b/code/dsaudio.cpp
index a4f60c7b..fb039196 100644
--- a/code/dsaudio.cpp
+++ b/code/dsaudio.cpp
@@ -19,7 +19,7 @@
 #include "data.h"
 #include "dbgprint.h"
 #include "globals.h" // for GameInFocus
-#include "language\language.h"
+#include "language/language.h"
 #include "soscomp.h"
 #include "winfix.h"
 
diff --git a/code/egos.cpp b/code/egos.cpp
index 64d3cfc6..dab24256 100644
--- a/code/egos.cpp
+++ b/code/egos.cpp
@@ -54,7 +54,7 @@
 #include "globals.h"
 #include "goptions.h"
 #include "gscreen.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "misc.h"
 #include "ownrdraw.h"
 #include "scheme.h"
diff --git a/code/event.cpp b/code/event.cpp
index 19679101..866ab0c4 100644
--- a/code/event.cpp
+++ b/code/event.cpp
@@ -58,7 +58,7 @@
 #include "foot.h"
 #include "goptions.h"
 #include "house.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "mouse.h"
 #include "netsemantic.h"
 #include "rules.h"
diff --git a/code/gamedlg.cpp b/code/gamedlg.cpp
index 2440d99f..ba3c3999 100644
--- a/code/gamedlg.cpp
+++ b/code/gamedlg.cpp
@@ -43,7 +43,7 @@
 #include "dsaudio.h"
 #include "globals.h"
 #include "init.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "ownrdraw.h"
 #include "queue.h"
 #include "session.h"
diff --git a/code/goptions.cpp b/code/goptions.cpp
index c22beb60..4f2dfa67 100644
--- a/code/goptions.cpp
+++ b/code/goptions.cpp
@@ -40,7 +40,7 @@
 #include "data.h"
 #include "dbgprint.h"
 #include "gamedlg.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "loaddlg.h"
 #include "ownrdraw.h"
 #include "queue.h"
diff --git a/code/house.cpp b/code/house.cpp
index 931d66a1..e8e5b88c 100644
--- a/code/house.cpp
+++ b/code/house.cpp
@@ -159,7 +159,7 @@
 #include "infatype.h"
 #include "inline.h"
 #include "ion.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "lightcon.h"
 #include "logic.h"
 #include "mono.h"
diff --git a/code/infantry.cpp b/code/infantry.cpp
index 86b08d7f..5498ce30 100644
--- a/code/infantry.cpp
+++ b/code/infantry.cpp
@@ -113,7 +113,7 @@
 #include "inline.h"
 #include "ion.h"
 #include "isotype.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "lightcon.h"
 #include "mixfile.h"
 #include "mono.h"
diff --git a/code/init.cpp b/code/init.cpp
index 7bc8abe2..ba33dcc3 100644
--- a/code/init.cpp
+++ b/code/init.cpp
@@ -121,7 +121,7 @@
 #include "ionblast.h"
 #include "ipxmgr.h"
 #include "keyboard.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "laser.h"
 #include "light.h"
 #include "lightcon.h"
diff --git a/code/ion.cpp b/code/ion.cpp
index 43e50167..c4ce335a 100644
--- a/code/ion.cpp
+++ b/code/ion.cpp
@@ -30,7 +30,7 @@
 #include "globals.h"
 #include "gscreen.h"
 #include "house.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "laser.h"
 #include "lightcon.h"
 #include "mixfile.h"
diff --git a/code/list.cpp b/code/list.cpp
index bbe11fc0..0059e6d5 100644
--- a/code/list.cpp
+++ b/code/list.cpp
@@ -63,7 +63,7 @@
 #include "dialog.h"
 #include "dsurface.h"
 #include "font.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "scheme.h"
 #include "vector.h"
 #include "wwmouse.h"
diff --git a/code/loaddlg.cpp b/code/loaddlg.cpp
index a3306cc3..be585310 100644
--- a/code/loaddlg.cpp
+++ b/code/loaddlg.cpp
@@ -48,7 +48,7 @@
 #include "globals.h"
 #include "houstype.h"
 #include "init.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "msgbox.h"
 #include "ownrdraw.h"
 #include "saveload.h"
diff --git a/code/mainloop.cpp b/code/mainloop.cpp
index 8a2ed93e..d4d0276e 100644
--- a/code/mainloop.cpp
+++ b/code/mainloop.cpp
@@ -38,7 +38,7 @@
 #include "globals.h"
 #include "goptions.h"
 #include "ipxmgr.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "logic.h"
 #include "misc.h"
 #include "mpscore.h"
diff --git a/code/mainopt.cpp b/code/mainopt.cpp
index 891cdcd9..2f078ab6 100644
--- a/code/mainopt.cpp
+++ b/code/mainopt.cpp
@@ -23,7 +23,7 @@
 #include "gamedlg.h"
 #include "globals.h"
 #include "init.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "misc.h"
 #include "video.h"
 #include "mixfile.h"
diff --git a/code/mapgen.cpp b/code/mapgen.cpp
index d5ed5610..97849258 100644
--- a/code/mapgen.cpp
+++ b/code/mapgen.cpp
@@ -38,7 +38,7 @@
 #include "init.h"
 #include "inline.h"
 #include "isotype.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "netshare.h"
 #include "nodes.h"
 #include "overtype.h"
diff --git a/code/mpscore.cpp b/code/mpscore.cpp
index bf2561ba..ca2e03c7 100644
--- a/code/mpscore.cpp
+++ b/code/mpscore.cpp
@@ -27,7 +27,7 @@
 #include "houstype.h"
 #include "incdec.h"
 #include "keyboard.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "msanim.h"
 #include "msengine.h"
 #include "msfont.h"
diff --git a/code/msgbox.h b/code/msgbox.h
index 95933cb2..77532ad8 100644
--- a/code/msgbox.h
+++ b/code/msgbox.h
@@ -32,7 +32,7 @@
 
 #pragma once
 
-#include "language\language.h"
+#include "language/language.h"
 #include "win.h"
 
 class WWMessageBox
diff --git a/code/netdlg.cpp b/code/netdlg.cpp
index 8997e390..1262564e 100644
--- a/code/netdlg.cpp
+++ b/code/netdlg.cpp
@@ -112,7 +112,7 @@
 #include "globals.h"
 #include "houstype.h"
 #include "ipxmgr.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "list.h"
 #include "queue.h"
 #include "rules.h"
diff --git a/code/netdlg2.cpp b/code/netdlg2.cpp
index 7e679fcb..d21717b1 100644
--- a/code/netdlg2.cpp
+++ b/code/netdlg2.cpp
@@ -28,7 +28,7 @@
 #include "houstype.h"
 #include "init.h"
 #include "ipxmgr.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "mapgen.h"
 #include "mplayer.h"
 #include "msgbox.h"
diff --git a/code/netshare.cpp b/code/netshare.cpp
index 1bee7959..46f4c278 100644
--- a/code/netshare.cpp
+++ b/code/netshare.cpp
@@ -18,7 +18,7 @@
 #include "globals.h"
 #include "goptions.h"
 #include "ipxmgr.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "lzopipe.h"
 #include "lzostraw.h"
 #include "mapgen.h"
diff --git a/code/options.cpp b/code/options.cpp
index d5cbb84f..ca757610 100644
--- a/code/options.cpp
+++ b/code/options.cpp
@@ -72,7 +72,7 @@
 #include "init.h"
 #include "ipxmgr.h"
 #include "keyboard.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "mouse.h"
 #include "msgbox.h"
 #include "ownrdraw.h"
diff --git a/code/ownrdraw.cpp b/code/ownrdraw.cpp
index 148f1ef8..4ae0a92b 100644
--- a/code/ownrdraw.cpp
+++ b/code/ownrdraw.cpp
@@ -28,7 +28,7 @@
 #include "goptions.h"
 #include "hsv.h"
 #include "keyboard.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "mainloop.h"
 #include "misc.h"
 #include "msgroute.h"
diff --git a/code/power.cpp b/code/power.cpp
index 4dd473ff..8bb08a1a 100644
--- a/code/power.cpp
+++ b/code/power.cpp
@@ -56,7 +56,7 @@
 #include "draw.h"
 #include "globals.h"
 #include "house.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "mixfile.h"
 #include "savestream.h"
 #include "surface.h"
diff --git a/code/preview.cpp b/code/preview.cpp
index 3635d609..a7ba4010 100644
--- a/code/preview.cpp
+++ b/code/preview.cpp
@@ -19,7 +19,7 @@
 #include "cell.h"
 #include "dbgprint.h"
 #include "dsurface.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "lzopipe.h"
 #include "lzostraw.h"
 #include "overtype.h"
diff --git a/code/progress.cpp b/code/progress.cpp
index 552fc04e..68fd2e9e 100644
--- a/code/progress.cpp
+++ b/code/progress.cpp
@@ -20,7 +20,7 @@
 #include "draw.h"
 #include "gscreen.h"
 #include "init.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "lightcon.h"
 #include "mixfile.h"
 #include "ownrdraw.h"
diff --git a/code/queue.cpp b/code/queue.cpp
index 831e1140..66258239 100644
--- a/code/queue.cpp
+++ b/code/queue.cpp
@@ -118,7 +118,7 @@
 #include "infatype.h"
 #include "ipxmgr.h"
 #include "keyboard.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "light.h"
 #include "mainloop.h"
 #include "mono.h"
diff --git a/code/radar.cpp b/code/radar.cpp
index 388f938b..5b8e89da 100644
--- a/code/radar.cpp
+++ b/code/radar.cpp
@@ -92,7 +92,7 @@
 #include "infantry.h"
 #include "infatype.h"
 #include "init.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "lightcon.h"
 #include "mixfile.h"
 #include "movies.h"
diff --git a/code/restate.cpp b/code/restate.cpp
index 0da391d8..673fe4e6 100644
--- a/code/restate.cpp
+++ b/code/restate.cpp
@@ -24,7 +24,7 @@
 #include "dbgprint.h"
 #include "globals.h"
 #include "keyboard.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "movie.h"
 #include "msanim.h"
 #include "msengine.h"
diff --git a/code/saveload.cpp b/code/saveload.cpp
index bcaa5dcc..90bd891b 100644
--- a/code/saveload.cpp
+++ b/code/saveload.cpp
@@ -82,7 +82,7 @@
 #include "infatype.h"
 #include "init.h"
 #include "ion.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "loaddlg.h"
 #include "light.h"
 #include "logic.h"
diff --git a/code/scenario.cpp b/code/scenario.cpp
index e19fd7e0..4b893dd0 100644
--- a/code/scenario.cpp
+++ b/code/scenario.cpp
@@ -107,7 +107,7 @@
 #include "ion.h"
 #include "ipxmgr.h"
 #include "isotype.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "light.h"
 #include "logic.h"
 #include "mainopt.h"
diff --git a/code/score.cpp b/code/score.cpp
index 701bb4ef..7fd1885b 100644
--- a/code/score.cpp
+++ b/code/score.cpp
@@ -61,7 +61,7 @@
 #include "goptions.h"
 #include "houstype.h"
 #include "keyboard.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "misc.h"
 #include "mixfile.h"
 #include "movie.h"
diff --git a/code/session.cpp b/code/session.cpp
index 4782befb..20d67b4f 100644
--- a/code/session.cpp
+++ b/code/session.cpp
@@ -59,7 +59,7 @@
 #include "gamedirs.h"		// for Search_Files.
 #include "globals.h"
 #include "ipxmgr.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "msgloop.h"
 #include "progress.h"
 #include "queue.h"
diff --git a/code/sidebar.cpp b/code/sidebar.cpp
index 4ca14117..4caf915b 100644
--- a/code/sidebar.cpp
+++ b/code/sidebar.cpp
@@ -99,7 +99,7 @@
 #include "goptions.h"
 #include "house.h"
 #include "incdec.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "map.h"
 #include "mixfile.h"
 #include "movie.h"
diff --git a/code/skirmish.cpp b/code/skirmish.cpp
index 83073897..81e48432 100644
--- a/code/skirmish.cpp
+++ b/code/skirmish.cpp
@@ -17,7 +17,7 @@
 #include "goptions.h"
 #include "houstype.h"
 #include "init.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "mapgen.h"
 #include "mplayer.h"
 #include "msgbox.h"
diff --git a/code/sounddlg.cpp b/code/sounddlg.cpp
index 3fa7c19b..1f6af60c 100644
--- a/code/sounddlg.cpp
+++ b/code/sounddlg.cpp
@@ -42,7 +42,7 @@
 #include "goptions.h"
 #include "incdec.h"
 #include "init.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "ownrdraw.h"
 #include "theme.h"
 #include "winfix.h"
diff --git a/code/spawner.cpp b/code/spawner.cpp
index 5cf1cb24..6d29d356 100644
--- a/code/spawner.cpp
+++ b/code/spawner.cpp
@@ -25,7 +25,7 @@
 #include "houstype.h"
 #include "init.h"
 #include "ipxmgr.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "loaddlg.h"
 #include "mplayer.h"
 #include "netshare.h"
diff --git a/code/startup.cpp b/code/startup.cpp
index 22199f90..3dffa629 100644
--- a/code/startup.cpp
+++ b/code/startup.cpp
@@ -90,7 +90,7 @@
 #include "ipxmgr.h"
 #include "isotype.h"
 #include "jumpjet.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "levitate.h"
 #include "light.h"
 #include "lightcon.h"
diff --git a/code/super.cpp b/code/super.cpp
index 2c204708..bdf38014 100644
--- a/code/super.cpp
+++ b/code/super.cpp
@@ -62,7 +62,7 @@
 #include "infatype.h"
 #include "inline.h"
 #include "ionblast.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "mouse.h"
 #include "rules.h"
 #include "savestream.h"
diff --git a/code/tab.cpp b/code/tab.cpp
index c6dac143..3312c961 100644
--- a/code/tab.cpp
+++ b/code/tab.cpp
@@ -47,7 +47,7 @@
 #include "dialog.h"
 #include "draw.h"
 #include "goptions.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "mixfile.h"
 #include "queue.h"
 #include "rules.h"
diff --git a/code/techno.cpp b/code/techno.cpp
index 2cfded41..3531ed06 100644
--- a/code/techno.cpp
+++ b/code/techno.cpp
@@ -169,7 +169,7 @@
 #include "ion.h"
 #include "isotile.h"
 #include "isotype.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "laser.h"
 #include "lightcon.h"
 #include "mono.h"
diff --git a/code/textbtn.cpp b/code/textbtn.cpp
index 747d30a8..7fd74379 100644
--- a/code/textbtn.cpp
+++ b/code/textbtn.cpp
@@ -45,7 +45,7 @@
 #include "data.h"
 #include "dialog.h"
 #include "font.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "lightcon.h"
 #include "scheme.h"
 #include "surface.h"
diff --git a/code/wdtconflict.cpp b/code/wdtconflict.cpp
index 322e5a0e..9ff4cc88 100644
--- a/code/wdtconflict.cpp
+++ b/code/wdtconflict.cpp
@@ -10,7 +10,7 @@
 #include "always.h"
 
 #include "data.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "wdtnet.h"
 
 using namespace WorldDominationTour;
diff --git a/code/wdtgameoptions.cpp b/code/wdtgameoptions.cpp
index b88b256a..51a3bfc0 100644
--- a/code/wdtgameoptions.cpp
+++ b/code/wdtgameoptions.cpp
@@ -10,7 +10,7 @@
 #include "always.h"
 
 #include "data.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "wdtnet.h"
 
 using namespace WorldDominationTour;
diff --git a/code/wdtprops.cpp b/code/wdtprops.cpp
index f5bb1d19..d4d5c0c9 100644
--- a/code/wdtprops.cpp
+++ b/code/wdtprops.cpp
@@ -10,7 +10,7 @@
 #include "always.h"
 
 #include "data.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "ownrdraw.h"
 #include "wdtnet.h"
 
diff --git a/code/wdtsel.cpp b/code/wdtsel.cpp
index 82c78a6a..b6f362ea 100644
--- a/code/wdtsel.cpp
+++ b/code/wdtsel.cpp
@@ -8,7 +8,7 @@
  ******************************************************************************/
 
 #include "always.h"
-#include "language\language.h"
+#include "language/language.h"
 
 #include "_keyboar.h"
 #include "_surface.h"
diff --git a/code/worlddom.cpp b/code/worlddom.cpp
index 6bdbe41f..a6d97274 100644
--- a/code/worlddom.cpp
+++ b/code/worlddom.cpp
@@ -15,7 +15,7 @@
 #include "_pk.h"
 #include "addon.h"
 #include "grphmenu.h"
-#include "language\language.h"
+#include "language/language.h"
 #include "mapgen.h"
 #include "mixfile.h"
 #include "ownrdraw.h"
diff --git a/docs/BUILDING.md b/docs/BUILDING.md
index 01980ddc..0e0116ff 100644
--- a/docs/BUILDING.md
+++ b/docs/BUILDING.md
@@ -93,6 +93,19 @@ The toolchain requires `clang-cl`, `lld-link`, `llvm-lib`, `llvm-mt`, `llvm-rc`,
 and `uasm` on `PATH`. It exports `compile_commands.json`; one configuration in
 `.vscode/c_cpp_properties.clang.example.json` reads that file for IntelliSense.
 
+## Experimental native build
+
+An unsupported native build for the host platform is available for portability
+work. It does not expand the supported build matrix or establish runtime
+behavior.
+
+```bash
+cmake -S . -B build/native -G Ninja \
+  -DCMAKE_BUILD_TYPE=Release \
+  -DOPENTS_EXPERIMENTAL_NATIVE=ON
+cmake --build build/native
+```
+
 ## Build from Visual Studio Code
 
 With the recommended extensions installed, the repository provides: