diff --git a/CMakeLists.txt b/CMakeLists.txt
index 306aaffd..68cea588 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -296,7 +296,6 @@ set(LOVR_SRC
   src/core/fs.c
   src/core/maf.c
   src/core/map.c
-  src/core/platform.c
   src/core/ref.c
   src/core/utf.c
   src/core/util.c
@@ -513,6 +512,7 @@ endif()
 
 # Platforms
 if(WIN32)
+  target_sources(lovr PRIVATE src/core/os_win32.c)
   set_target_properties(lovr PROPERTIES COMPILE_FLAGS "/wd4244 /MP")
   set_target_properties(lovr PROPERTIES LINK_FLAGS_DEBUG "/SUBSYSTEM:CONSOLE")
   set_target_properties(lovr PROPERTIES LINK_FLAGS_RELEASE "/SUBSYSTEM:windows /ENTRY:mainCRTStartup")
@@ -541,6 +541,7 @@ if(WIN32)
   move_dll(${LOVR_LEAP})
   target_compile_definitions(lovr PRIVATE -DLOVR_GL)
 elseif(APPLE)
+  target_sources(lovr PRIVATE src/core/os_macos.c)
   target_compile_definitions(lovr PRIVATE -DLOVR_GL)
   if(LOVR_BUILD_BUNDLE)
     function(move_lib)
@@ -570,10 +571,13 @@ elseif(APPLE)
     )
   endif()
 elseif(EMSCRIPTEN)
+  target_sources(lovr PRIVATE src/core/os_web.c)
   target_compile_definitions(lovr PRIVATE -DLOVR_WEBGL)
 elseif(ANDROID)
+  target_sources(lovr PRIVATE src/core/os_android.c)
   target_link_libraries(lovr log EGL GLESv3)
   target_compile_definitions(lovr PRIVATE -DLOVR_GLES)
 elseif(UNIX)
+  target_sources(lovr PRIVATE src/core/os_linux.c)
   target_compile_definitions(lovr PRIVATE -DLOVR_GL)
 endif()
diff --git a/Tupfile b/Tupfile
index d8285b34..772a8ed9 100644
--- a/Tupfile
+++ b/Tupfile
@@ -5,7 +5,7 @@ SRC += src/core/arr.c
 SRC += src/core/fs.c
 SRC += src/core/maf.c
 SRC += src/core/map.c
-SRC += src/core/platform.c
+SRC += src/core/os_$(PLATFORM).c
 SRC += src/core/ref.c
 SRC += src/core/utf.c
 SRC += src/core/util.c
diff --git a/Tuprules.tup b/Tuprules.tup
index 088edebb..b09ef593 100644
--- a/Tuprules.tup
+++ b/Tuprules.tup
@@ -41,14 +41,25 @@ CFLAGS_@(WEBVR) += LOVR_USE_WEBVR
 CFLAGS_@(LEAP) += LOVR_USE_LEAP
 
 ## Platforms
-# $(LDFLAGS_@(TUP_PLATFORM)) doesn't seem to work, oh well
-ifeq (@(TUP_PLATFORM),macosx)
+# A little gnarly, but basically you can set CONFIG_PLATFORM to pick a specific one, otherwise
+# we use the builtin TUP_PLATFORM which is the current OS (so it won't work with android/web).
+# Also macosx gets converted to macos
+ifeq (@(PLATFORM),)
+  PLATFORM = @(TUP_PLATFORM)
+else
+  PLATFORM = @(PLATFORM)
+endif
+ifeq ($(PLATFORM),macosx)
+  PLATFORM = macos
+endif
+
+ifeq ($(PLATFORM),macosx)
   LDFLAGS += -lobjc
   LDFLAGS += -pagezero_size 10000 -image_base 100000000
   ORIGIN = @executable_path
   SO = dylib
 endif
-ifeq (@(TUP_PLATFORM),linux)
+ifeq ($(PLATFORM),linux)
   LDFLAGS += -lm -lpthread
   ORIGIN = \$ORIGIN
   SO = so
diff --git a/src/api/api.c b/src/api/api.c
index 55e483ca..8b41beaa 100644
--- a/src/api/api.c
+++ b/src/api/api.c
@@ -1,6 +1,6 @@
 #include "api.h"
+#include "core/os.h"
 #include "core/ref.h"
-#include "core/platform.h"
 #include "core/util.h"
 #include <stdlib.h>
 #include <stdarg.h>
diff --git a/src/api/l_event.c b/src/api/l_event.c
index c4de5314..c601d3c5 100644
--- a/src/api/l_event.c
+++ b/src/api/l_event.c
@@ -1,7 +1,7 @@
 #include "api.h"
 #include "event/event.h"
 #include "thread/thread.h"
-#include "core/platform.h"
+#include "core/os.h"
 #include "core/ref.h"
 #include "core/util.h"
 #include <stdlib.h>
diff --git a/src/api/l_filesystem.c b/src/api/l_filesystem.c
index b4c625dc..e1d0845d 100644
--- a/src/api/l_filesystem.c
+++ b/src/api/l_filesystem.c
@@ -2,7 +2,7 @@
 #include "filesystem/filesystem.h"
 #include "data/blob.h"
 #include "core/fs.h"
-#include "core/platform.h"
+#include "core/os.h"
 #include "core/ref.h"
 #include <stdlib.h>
 #include <string.h>
diff --git a/src/api/l_lovr.c b/src/api/l_lovr.c
index 4fdc0fa9..eb0897a8 100644
--- a/src/api/l_lovr.c
+++ b/src/api/l_lovr.c
@@ -1,6 +1,6 @@
 #include "api.h"
+#include "core/os.h"
 #include "core/util.h"
-#include "core/platform.h"
 #include "lib/lua-cjson/lua_cjson.h"
 #include "lib/lua-enet/enet.h"
 
diff --git a/src/core/platform.h b/src/core/os.h
similarity index 100%
rename from src/core/platform.h
rename to src/core/os.h
diff --git a/src/core/platform_android.c.h b/src/core/os_android.c
similarity index 100%
rename from src/core/platform_android.c.h
rename to src/core/os_android.c
diff --git a/src/core/platform_glfw.c.h b/src/core/os_glfw.h
similarity index 99%
rename from src/core/platform_glfw.c.h
rename to src/core/os_glfw.h
index 80435f65..ae852a18 100644
--- a/src/core/platform_glfw.c.h
+++ b/src/core/os_glfw.h
@@ -1,7 +1,5 @@
 #include "util.h"
 
-// Include this in ONE translation unit
-
 #define GLFW_INCLUDE_NONE
 #include <GLFW/glfw3.h>
 #ifndef EMSCRIPTEN
diff --git a/src/core/platform_linux.c.h b/src/core/os_linux.c
similarity index 94%
rename from src/core/platform_linux.c.h
rename to src/core/os_linux.c
index 1eb5d3fb..a26136e4 100644
--- a/src/core/platform_linux.c.h
+++ b/src/core/os_linux.c
@@ -1,8 +1,8 @@
-#include "platform.h"
+#include "os.h"
 #include <string.h>
 #include <time.h>
 
-#include "platform_glfw.c.h"
+#include "os_glfw.h"
 
 static uint64_t epoch;
 #define NS_PER_SEC 1000000000ULL
diff --git a/src/core/platform_macos.c.h b/src/core/os_macos.c
similarity index 100%
rename from src/core/platform_macos.c.h
rename to src/core/os_macos.c
diff --git a/src/core/platform_web.c.h b/src/core/os_web.c
similarity index 100%
rename from src/core/platform_web.c.h
rename to src/core/os_web.c
diff --git a/src/core/platform_windows.c.h b/src/core/os_win32.c
similarity index 100%
rename from src/core/platform_windows.c.h
rename to src/core/os_win32.c
diff --git a/src/core/platform.c b/src/core/platform.c
deleted file mode 100644
index f27113ae..00000000
--- a/src/core/platform.c
+++ /dev/null
@@ -1,13 +0,0 @@
-#include "platform.h"
-
-#ifdef _WIN32
-#include "platform_windows.c.h"
-#elif __APPLE__
-#include "platform_macos.c.h"
-#elif __ANDROID__
-#include "platform_android.c.h"
-#elif __linux__
-#include "platform_linux.c.h"
-#elif EMSCRIPTEN
-#include "platform_web.c.h"
-#endif
diff --git a/src/main.c b/src/main.c
index 4f2345b9..5696bbeb 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,6 +1,6 @@
 #include "resources/boot.lua.h"
 #include "api/api.h"
-#include "core/platform.h"
+#include "core/os.h"
 #include "core/util.h"
 #include <stdbool.h>
 #include <string.h>
diff --git a/src/modules/event/event.c b/src/modules/event/event.c
index 08a2d452..cdd82db4 100644
--- a/src/modules/event/event.c
+++ b/src/modules/event/event.c
@@ -1,6 +1,6 @@
 #include "event/event.h"
 #include "core/arr.h"
-#include "core/platform.h"
+#include "core/os.h"
 #include "core/ref.h"
 #include "core/util.h"
 #include <stdlib.h>
diff --git a/src/modules/graphics/graphics.h b/src/modules/graphics/graphics.h
index 6d9ed56b..442f356b 100644
--- a/src/modules/graphics/graphics.h
+++ b/src/modules/graphics/graphics.h
@@ -1,7 +1,7 @@
 #include "graphics/font.h"
 #include "data/modelData.h"
 #include "core/maf.h"
-#include "core/platform.h"
+#include "core/os.h"
 #include "core/util.h"
 #include <stdbool.h>
 #include <stdint.h>
diff --git a/src/modules/headset/desktop.c b/src/modules/headset/desktop.c
index d39039e9..361da066 100644
--- a/src/modules/headset/desktop.c
+++ b/src/modules/headset/desktop.c
@@ -1,7 +1,7 @@
 #include "headset/headset.h"
 #include "graphics/graphics.h"
 #include "core/maf.h"
-#include "core/platform.h"
+#include "core/os.h"
 #include "core/util.h"
 #include <math.h>
 #include <stdint.h>
diff --git a/src/modules/headset/leap.c b/src/modules/headset/leap.c
index 9c85b301..95c2b732 100644
--- a/src/modules/headset/leap.c
+++ b/src/modules/headset/leap.c
@@ -1,6 +1,6 @@
 #include "headset/headset.h"
 #include "core/maf.h"
-#include "core/platform.h"
+#include "core/os.h"
 #include "core/util.h"
 #include "lib/tinycthread/tinycthread.h"
 #include <LeapC.h>
diff --git a/src/modules/headset/oculus_mobile.c b/src/modules/headset/oculus_mobile.c
index a9a251df..8eb0f5cd 100644
--- a/src/modules/headset/oculus_mobile.c
+++ b/src/modules/headset/oculus_mobile.c
@@ -2,7 +2,7 @@
 #include "oculus_mobile_bridge.h"
 #include "graphics/graphics.h"
 #include "graphics/canvas.h"
-#include "core/platform.h"
+#include "core/os.h"
 #include "lib/glad/glad.h"
 #include <android/log.h>
 #include <assert.h>
diff --git a/src/modules/headset/openvr.c b/src/modules/headset/openvr.c
index 246e91ed..8f8bb2e2 100644
--- a/src/modules/headset/openvr.c
+++ b/src/modules/headset/openvr.c
@@ -8,7 +8,7 @@
 #include "graphics/graphics.h"
 #include "graphics/canvas.h"
 #include "core/maf.h"
-#include "core/platform.h"
+#include "core/os.h"
 #include "core/ref.h"
 #include <stdbool.h>
 #include <stdio.h>
diff --git a/src/modules/timer/timer.c b/src/modules/timer/timer.c
index 7ce4d1d2..8a6b9e44 100644
--- a/src/modules/timer/timer.c
+++ b/src/modules/timer/timer.c
@@ -1,5 +1,5 @@
 #include "timer/timer.h"
-#include "core/platform.h"
+#include "core/os.h"
 #include <string.h>
 
 static struct {
diff --git a/tup.config b/tup.config
index 678063e2..a1f7fd72 100644
--- a/tup.config
+++ b/tup.config
@@ -11,6 +11,7 @@
 # CMAKE_DEPS: Assume libraries were built by CMake in the `build` folder.
 # EXTRA_CFLAGS: Additional compiler flags (e.g. libraries, warnings).
 # EXTRA_LDFLAGS: Additional linker flags.
+# PLATFORM: The platform to compile for (win32, macos, linux, android, web, or blank to autodetect).
 CONFIG_CC=clang
 CONFIG_STRICT=y
 CONFIG_DEBUG=y
@@ -19,6 +20,7 @@ CONFIG_SANITIZE=n
 CONFIG_CMAKE_DEPS=y
 CONFIG_EXTRA_CFLAGS=
 CONFIG_EXTRA_LDFLAGS=
+CONFIG_PLATFORM=
 
 ## Modules
 # The set of enabled Lua modules.