diff --git a/include/bx/config.h b/include/bx/config.h
index 2f7264f..afc7e9c 100644
--- a/include/bx/config.h
+++ b/include/bx/config.h
@@ -18,7 +18,6 @@
 
 #ifndef BX_CONFIG_CRT_FILE_READER_WRITER
 #	define BX_CONFIG_CRT_FILE_READER_WRITER !(0 \
-			|| BX_PLATFORM_NACL                 \
 			|| BX_CRT_NONE                      \
 			)
 #endif // BX_CONFIG_CRT_FILE_READER_WRITER
@@ -27,7 +26,6 @@
 #	define BX_CONFIG_CRT_PROCESS !(0  \
 			|| BX_CRT_NONE            \
 			|| BX_PLATFORM_EMSCRIPTEN \
-			|| BX_PLATFORM_NACL       \
 			|| BX_PLATFORM_PS4        \
 			|| BX_PLATFORM_WINRT      \
 			|| BX_PLATFORM_XBOXONE    \
diff --git a/include/bx/platform.h b/include/bx/platform.h
index 7e7591d..77742db 100644
--- a/include/bx/platform.h
+++ b/include/bx/platform.h
@@ -51,7 +51,6 @@
 #define BX_PLATFORM_HURD       0
 #define BX_PLATFORM_IOS        0
 #define BX_PLATFORM_LINUX      0
-#define BX_PLATFORM_NACL       0
 #define BX_PLATFORM_OSX        0
 #define BX_PLATFORM_PS4        0
 #define BX_PLATFORM_QNX        0
@@ -181,11 +180,6 @@
 #	include <sys/cdefs.h> // Defines __BIONIC__ and includes android/api-level.h
 #	undef  BX_PLATFORM_ANDROID
 #	define BX_PLATFORM_ANDROID __ANDROID_API__
-#elif defined(__native_client__)
-// NaCl compiler defines __linux__
-#	include <ppapi/c/pp_macros.h>
-#	undef  BX_PLATFORM_NACL
-#	define BX_PLATFORM_NACL PPAPI_RELEASE
 #elif defined(__STEAMLINK__)
 // SteamLink compiler defines __linux__
 #	undef  BX_PLATFORM_STEAMLINK
@@ -263,7 +257,6 @@
 		|| BX_PLATFORM_HURD       \
 		|| BX_PLATFORM_IOS        \
 		|| BX_PLATFORM_LINUX      \
-		|| BX_PLATFORM_NACL       \
 		|| BX_PLATFORM_OSX        \
 		|| BX_PLATFORM_QNX        \
 		|| BX_PLATFORM_STEAMLINK  \
@@ -278,7 +271,6 @@
 		|| BX_PLATFORM_HURD       \
 		|| BX_PLATFORM_IOS        \
 		|| BX_PLATFORM_LINUX      \
-		|| BX_PLATFORM_NACL       \
 		|| BX_PLATFORM_OSX        \
 		|| BX_PLATFORM_PS4        \
 		|| BX_PLATFORM_QNX        \
@@ -334,9 +326,6 @@
 #	define BX_PLATFORM_NAME "iOS"
 #elif BX_PLATFORM_LINUX
 #	define BX_PLATFORM_NAME "Linux"
-#elif BX_PLATFORM_NACL
-#	define BX_PLATFORM_NAME "NaCl " \
-				BX_STRINGIZE(BX_PLATFORM_NACL)
 #elif BX_PLATFORM_OSX
 #	define BX_PLATFORM_NAME "OSX"
 #elif BX_PLATFORM_PS4
diff --git a/makefile b/makefile
index bf8d911..e377204 100644
--- a/makefile
+++ b/makefile
@@ -11,9 +11,6 @@ all:
 	$(GENIE) --gcc=android-arm gmake
 	$(GENIE) --gcc=android-mips gmake
 	$(GENIE) --gcc=android-x86 gmake
-	$(GENIE) --gcc=nacl gmake
-	$(GENIE) --gcc=nacl-arm gmake
-	$(GENIE) --gcc=pnacl gmake
 	$(GENIE) --gcc=mingw-gcc gmake
 	$(GENIE) --gcc=linux-gcc gmake
 	$(GENIE) --gcc=osx gmake
@@ -87,34 +84,6 @@ mingw-clang: mingw-clang-debug32 mingw-clang-release32 mingw-clang-debug64 mingw
 .build/projects/vs2013:
 	$(GENIE) vs2013
 
-.build/projects/gmake-nacl:
-	$(GENIE) --gcc=nacl gmake
-nacl-debug32: .build/projects/gmake-nacl
-	make -R -C .build/projects/gmake-nacl config=debug32
-nacl-release32: .build/projects/gmake-nacl
-	make -R -C .build/projects/gmake-nacl config=release32
-nacl-debug64: .build/projects/gmake-nacl
-	make -R -C .build/projects/gmake-nacl config=debug64
-nacl-release64: .build/projects/gmake-nacl
-	make -R -C .build/projects/gmake-nacl config=release64
-nacl: nacl-debug32 nacl-release32 nacl-debug64 nacl-release64
-
-.build/projects/gmake-nacl-arm:
-	$(GENIE) --gcc=nacl-arm gmake
-nacl-arm-debug: .build/projects/gmake-nacl-arm
-	make -R -C .build/projects/gmake-nacl-arm config=debug
-nacl-arm-release: .build/projects/gmake-nacl-arm
-	make -R -C .build/projects/gmake-nacl-arm config=release
-nacl-arm: nacl-arm-debug32 nacl-arm-release32
-
-.build/projects/gmake-pnacl:
-	$(GENIE) --gcc=pnacl gmake
-pnacl-debug: .build/projects/gmake-pnacl
-	make -R -C .build/projects/gmake-pnacl config=debug
-pnacl-release: .build/projects/gmake-pnacl
-	make -R -C .build/projects/gmake-pnacl config=release
-pnacl: pnacl-debug pnacl-release
-
 .build/projects/gmake-osx:
 	$(GENIE) --gcc=osx gmake
 osx-debug32: .build/projects/gmake-osx
diff --git a/scripts/genie.lua b/scripts/genie.lua
index 9919b8c..c01358e 100644
--- a/scripts/genie.lua
+++ b/scripts/genie.lua
@@ -75,20 +75,6 @@ project "bx.test"
 			"-shared",
 		}
 
-	configuration { "nacl or nacl-arm" }
-		targetextension ".nexe"
-		links {
-			"ppapi",
-			"pthread",
-		}
-
-	configuration { "pnacl" }
-		targetextension ".pexe"
-		links {
-			"ppapi",
-			"pthread",
-		}
-
 	configuration { "linux-*" }
 		links {
 			"pthread",
@@ -134,20 +120,6 @@ project "bx.bench"
 			"-shared",
 		}
 
-	configuration { "nacl or nacl-arm" }
-		targetextension ".nexe"
-		links {
-			"ppapi",
-			"pthread",
-		}
-
-	configuration { "pnacl" }
-		targetextension ".pexe"
-		links {
-			"ppapi",
-			"pthread",
-		}
-
 	configuration { "linux-*" }
 		links {
 			"pthread",
diff --git a/scripts/toolchain.lua b/scripts/toolchain.lua
index 6239d65..7cecee0 100644
--- a/scripts/toolchain.lua
+++ b/scripts/toolchain.lua
@@ -4,7 +4,6 @@
 --
 
 local bxDir = path.getabsolute("..")
-local naclToolchain = ""
 
 local function crtNone()
 
@@ -69,11 +68,8 @@ function toolchain(_buildDir, _libDir)
 			{ "tvos-simulator",  "tvOS - Simulator"           },
 			{ "mingw-gcc",       "MinGW"                      },
 			{ "mingw-clang",     "MinGW (clang compiler)"     },
-			{ "nacl",            "Native Client"              },
-			{ "nacl-arm",        "Native Client - ARM"        },
 			{ "netbsd",          "NetBSD"                     },
 			{ "osx",             "OSX"                        },
-			{ "pnacl",           "Native Client - PNaCl"      },
 			{ "orbis",           "Orbis"                      },
 			{ "qnx-arm",         "QNX/Blackberry - ARM"       },
 			{ "riscv",           "RISC-V"                     },
@@ -347,42 +343,6 @@ function toolchain(_buildDir, _libDir)
 --			premake.gcc.llvm = true
 			location (path.join(_buildDir, "projects", _ACTION .. "-mingw-clang"))
 
-		elseif "nacl" == _OPTIONS["gcc"] then
-
-			if not os.getenv("NACL_SDK_ROOT") then
-				print("Set NACL_SDK_ROOT enviroment variable.")
-			end
-
-			naclToolchain = "$(NACL_SDK_ROOT)/toolchain/win_x86_glibc/bin/x86_64-nacl-"
-			if os.is("macosx") then
-				naclToolchain = "$(NACL_SDK_ROOT)/toolchain/mac_x86_glibc/bin/x86_64-nacl-"
-			elseif os.is("linux") then
-				naclToolchain = "$(NACL_SDK_ROOT)/toolchain/linux_x86_glibc/bin/x86_64-nacl-"
-			end
-
-			premake.gcc.cc  = naclToolchain .. "gcc"
-			premake.gcc.cxx = naclToolchain .. "g++"
-			premake.gcc.ar  = naclToolchain .. "ar"
-			location (path.join(_buildDir, "projects", _ACTION .. "-nacl"))
-
-		elseif "nacl-arm" == _OPTIONS["gcc"] then
-
-			if not os.getenv("NACL_SDK_ROOT") then
-				print("Set NACL_SDK_ROOT enviroment variable.")
-			end
-
-			naclToolchain = "$(NACL_SDK_ROOT)/toolchain/win_arm_glibc/bin/arm-nacl-"
-			if os.is("macosx") then
-				naclToolchain = "$(NACL_SDK_ROOT)/toolchain/mac_arm_glibc/bin/arm-nacl-"
-			elseif os.is("linux") then
-				naclToolchain = "$(NACL_SDK_ROOT)/toolchain/linux_arm_glibc/bin/arm-nacl-"
-			end
-
-			premake.gcc.cc  = naclToolchain .. "gcc"
-			premake.gcc.cxx = naclToolchain .. "g++"
-			premake.gcc.ar  = naclToolchain .. "ar"
-			location (path.join(_buildDir, "projects", _ACTION .. "-nacl-arm"))
-
 		elseif "netbsd" == _OPTIONS["gcc"] then
 			location (path.join(_buildDir, "projects", _ACTION .. "-netbsd"))
 
@@ -400,24 +360,6 @@ function toolchain(_buildDir, _libDir)
 			end
 			location (path.join(_buildDir, "projects", _ACTION .. "-osx"))
 
-		elseif "pnacl" == _OPTIONS["gcc"] then
-
-			if not os.getenv("NACL_SDK_ROOT") then
-				print("Set NACL_SDK_ROOT enviroment variable.")
-			end
-
-			naclToolchain = "$(NACL_SDK_ROOT)/toolchain/win_pnacl/bin/pnacl-"
-			if os.is("macosx") then
-				naclToolchain = "$(NACL_SDK_ROOT)/toolchain/mac_pnacl/bin/pnacl-"
-			elseif os.is("linux") then
-				naclToolchain = "$(NACL_SDK_ROOT)/toolchain/linux_pnacl/bin/pnacl-"
-			end
-
-			premake.gcc.cc  = naclToolchain .. "clang"
-			premake.gcc.cxx = naclToolchain .. "clang++"
-			premake.gcc.ar  = naclToolchain .. "ar"
-			location (path.join(_buildDir, "projects", _ACTION .. "-pnacl"))
-
 		elseif "orbis" == _OPTIONS["gcc"] then
 
 			if not os.getenv("SCE_ORBIS_SDK_DIR") then
@@ -1037,83 +979,6 @@ function toolchain(_buildDir, _libDir)
 			path.join(bxDir, "include/compat/freebsd"),
 		}
 
-	configuration { "nacl or nacl-arm or pnacl" }
-		buildoptions {
-			"-U__STRICT_ANSI__", -- strcasecmp, setenv, unsetenv,...
-			"-fno-stack-protector",
-			"-fdiagnostics-show-option",
-			"-fdata-sections",
-			"-ffunction-sections",
-			"-Wunused-value",
-			"-Wundef",
-		}
-		buildoptions_cpp {
-			"-std=c++11",
-		}
-		includedirs {
-			"$(NACL_SDK_ROOT)/include",
-			path.join(bxDir, "include/compat/nacl"),
-		}
-
-	configuration { "nacl" }
-		buildoptions {
-			"-pthread",
-			"-mfpmath=sse", -- force SSE to get 32-bit and 64-bit builds deterministic.
-			"-msse2",
-		}
-		linkoptions {
-			"-Wl,--gc-sections",
-		}
-
-	configuration { "x32", "nacl" }
-		targetdir (path.join(_buildDir, "nacl-x86/bin"))
-		objdir (path.join(_buildDir, "nacl-x86/obj"))
-		libdirs { path.join(_libDir, "lib/nacl-x86") }
-		linkoptions { "-melf32_nacl" }
-
-	configuration { "x32", "nacl", "Debug" }
-		libdirs { "$(NACL_SDK_ROOT)/lib/glibc_x86_32/Debug" }
-
-	configuration { "x32", "nacl", "Release" }
-		libdirs { "$(NACL_SDK_ROOT)/lib/glibc_x86_32/Release" }
-
-	configuration { "x64", "nacl" }
-		targetdir (path.join(_buildDir, "nacl-x64/bin"))
-		objdir (path.join(_buildDir, "nacl-x64/obj"))
-		libdirs { path.join(_libDir, "lib/nacl-x64") }
-		linkoptions { "-melf64_nacl" }
-
-	configuration { "x64", "nacl", "Debug" }
-		libdirs { "$(NACL_SDK_ROOT)/lib/glibc_x86_64/Debug" }
-
-	configuration { "x64", "nacl", "Release" }
-		libdirs { "$(NACL_SDK_ROOT)/lib/glibc_x86_64/Release" }
-
-	configuration { "nacl-arm" }
-		buildoptions {
-			"-Wno-psabi", -- note: the mangling of 'va_list' has changed in GCC 4.4.0
-		}
-		targetdir (path.join(_buildDir, "nacl-arm/bin"))
-		objdir (path.join(_buildDir, "nacl-arm/obj"))
-		libdirs { path.join(_libDir, "lib/nacl-arm") }
-
-	configuration { "nacl-arm", "Debug" }
-		libdirs { "$(NACL_SDK_ROOT)/lib/glibc_arm/Debug" }
-
-	configuration { "nacl-arm", "Release" }
-		libdirs { "$(NACL_SDK_ROOT)/lib/glibc_arm/Release" }
-
-	configuration { "pnacl" }
-		targetdir (path.join(_buildDir, "pnacl/bin"))
-		objdir (path.join(_buildDir, "pnacl/obj"))
-		libdirs { path.join(_libDir, "lib/pnacl") }
-
-	configuration { "pnacl", "Debug" }
-		libdirs { "$(NACL_SDK_ROOT)/lib/pnacl/Debug" }
-
-	configuration { "pnacl", "Release" }
-		libdirs { "$(NACL_SDK_ROOT)/lib/pnacl/Release" }
-
 	configuration { "xbox360" }
 		targetdir (path.join(_buildDir, "xbox360/bin"))
 		objdir (path.join(_buildDir, "xbox360/obj"))
@@ -1420,18 +1285,6 @@ function strip()
 			"$(SILENT) $(MINGW)/bin/strip -s \"$(TARGET)\""
 		}
 
-	configuration { "pnacl" }
-		postbuildcommands {
-			"$(SILENT) echo Running pnacl-finalize.",
-			"$(SILENT) " .. naclToolchain .. "finalize \"$(TARGET)\""
-		}
-
-	configuration { "*nacl*", "Release" }
-		postbuildcommands {
-			"$(SILENT) echo Stripping symbols.",
-			"$(SILENT) " .. naclToolchain .. "strip -s \"$(TARGET)\""
-		}
-
 	configuration { "asmjs" }
 		postbuildcommands {
 			"$(SILENT) echo Running asmjs finalize.",
diff --git a/src/debug.cpp b/src/debug.cpp
index d0720b1..072379b 100644
--- a/src/debug.cpp
+++ b/src/debug.cpp
@@ -33,7 +33,7 @@ namespace bx
 #elif BX_CPU_ARM
 		__builtin_trap();
 //		asm("bkpt 0");
-#elif !BX_PLATFORM_NACL && BX_CPU_X86 && (BX_COMPILER_GCC || BX_COMPILER_CLANG)
+#elif BX_CPU_X86 && (BX_COMPILER_GCC || BX_COMPILER_CLANG)
 		// NaCl doesn't like int 3:
 		// NativeClient: NaCl module load failed: Validation failure. File violates Native Client safety rules.
 		__asm__ ("int $3");
diff --git a/src/mutex.cpp b/src/mutex.cpp
index 988084b..0c1232a 100644
--- a/src/mutex.cpp
+++ b/src/mutex.cpp
@@ -9,7 +9,6 @@
 
 #if    BX_PLATFORM_ANDROID \
 	|| BX_PLATFORM_LINUX   \
-	|| BX_PLATFORM_NACL    \
 	|| BX_PLATFORM_IOS     \
 	|| BX_PLATFORM_OSX     \
 	|| BX_PLATFORM_PS4     \
diff --git a/src/os.cpp b/src/os.cpp
index c88cb01..80ad15e 100644
--- a/src/os.cpp
+++ b/src/os.cpp
@@ -21,7 +21,6 @@
 	|| BX_PLATFORM_HURD       \
 	|| BX_PLATFORM_IOS        \
 	|| BX_PLATFORM_LINUX      \
-	|| BX_PLATFORM_NACL       \
 	|| BX_PLATFORM_OSX        \
 	|| BX_PLATFORM_PS4        \
 	|| BX_PLATFORM_RPI        \
@@ -29,7 +28,6 @@
 #	include <sched.h> // sched_yield
 #	if BX_PLATFORM_BSD  \
 	|| BX_PLATFORM_IOS  \
-	|| BX_PLATFORM_NACL \
 	|| BX_PLATFORM_OSX  \
 	|| BX_PLATFORM_PS4  \
 	|| BX_PLATFORM_STEAMLINK
@@ -37,9 +35,9 @@
 #	endif // BX_PLATFORM_*
 
 #	include <time.h> // nanosleep
-#	if !BX_PLATFORM_PS4 && !BX_PLATFORM_NACL
+#	if !BX_PLATFORM_PS4
 #		include <dlfcn.h> // dlopen, dlclose, dlsym
-#	endif // !BX_PLATFORM_PS4 && !BX_PLATFORM_NACL
+#	endif // !BX_PLATFORM_PS4
 
 #	if BX_PLATFORM_ANDROID
 #		include <malloc.h> // mallinfo
@@ -101,7 +99,7 @@ namespace bx
 		return (pid_t)::syscall(SYS_gettid);
 #elif BX_PLATFORM_IOS || BX_PLATFORM_OSX
 		return (mach_port_t)::pthread_mach_thread_np(pthread_self() );
-#elif BX_PLATFORM_BSD || BX_PLATFORM_NACL
+#elif BX_PLATFORM_BSD
 		// Casting __nc_basic_thread_data*... need better way to do this.
 		return *(uint32_t*)::pthread_self();
 #elif BX_PLATFORM_HURD
@@ -175,7 +173,6 @@ namespace bx
 #if BX_PLATFORM_WINDOWS
 		return (void*)::LoadLibraryA(_filePath);
 #elif  BX_PLATFORM_EMSCRIPTEN \
-	|| BX_PLATFORM_NACL       \
 	|| BX_PLATFORM_PS4        \
 	|| BX_PLATFORM_XBOXONE    \
 	|| BX_PLATFORM_WINRT
@@ -191,7 +188,6 @@ namespace bx
 #if BX_PLATFORM_WINDOWS
 		::FreeLibrary( (HMODULE)_handle);
 #elif  BX_PLATFORM_EMSCRIPTEN \
-	|| BX_PLATFORM_NACL       \
 	|| BX_PLATFORM_PS4        \
 	|| BX_PLATFORM_XBOXONE    \
 	|| BX_PLATFORM_WINRT
@@ -206,7 +202,6 @@ namespace bx
 #if BX_PLATFORM_WINDOWS
 		return (void*)::GetProcAddress( (HMODULE)_handle, _symbol);
 #elif  BX_PLATFORM_EMSCRIPTEN \
-	|| BX_PLATFORM_NACL       \
 	|| BX_PLATFORM_PS4        \
 	|| BX_PLATFORM_XBOXONE    \
 	|| BX_PLATFORM_WINRT
diff --git a/src/semaphore.cpp b/src/semaphore.cpp
index dae780d..ea4d615 100644
--- a/src/semaphore.cpp
+++ b/src/semaphore.cpp
@@ -135,7 +135,7 @@ namespace bx
 		int result = pthread_mutex_lock(&si->m_mutex);
 		BX_CHECK(0 == result, "pthread_mutex_lock %d", result);
 
-#		if BX_PLATFORM_NACL || BX_PLATFORM_OSX
+#		if BX_PLATFORM_OSX
 		BX_UNUSED(_msecs);
 		BX_CHECK(-1 == _msecs, "NaCl and OSX don't support pthread_cond_timedwait at this moment.");
 		while (0 == result
@@ -228,7 +228,7 @@ namespace bx
 	{
 		SemaphoreInternal* si = (SemaphoreInternal*)m_internal;
 
-#		if BX_PLATFORM_NACL || BX_PLATFORM_OSX
+#		if BX_PLATFORM_OSX
 		BX_CHECK(-1 == _msecs, "NaCl and OSX don't support sem_timedwait at this moment."); BX_UNUSED(_msecs);
 		return 0 == sem_wait(&si->m_handle);
 #		else
diff --git a/src/thread.cpp b/src/thread.cpp
index 70ea4a0..db4b038 100644
--- a/src/thread.cpp
+++ b/src/thread.cpp
@@ -7,7 +7,6 @@
 
 #if    BX_PLATFORM_ANDROID \
 	|| BX_PLATFORM_LINUX   \
-	|| BX_PLATFORM_NACL    \
 	|| BX_PLATFORM_IOS     \
 	|| BX_PLATFORM_OSX     \
 	|| BX_PLATFORM_PS4     \
diff --git a/tests/main_test.cpp b/tests/main_test.cpp
index b9d66db..261b62a 100644
--- a/tests/main_test.cpp
+++ b/tests/main_test.cpp
@@ -16,25 +16,6 @@ void ANativeActivity_onCreate(ANativeActivity*, void*, size_t)
 {
 	exit(runAllTests(BX_COUNTOF(s_argv), s_argv) );
 }
-#elif BX_PLATFORM_NACL
-#	include <ppapi/c/pp_errors.h>
-#	include <ppapi/c/ppp.h>
-
-PP_EXPORT const void* PPP_GetInterface(const char* /*_name*/)
-{
-	return NULL;
-}
-
-PP_EXPORT int32_t PPP_InitializeModule(PP_Module /*_module*/, PPB_GetInterface /*_interface*/)
-{
-	DBG("PPAPI version: %d", PPAPI_RELEASE);
-	runAllTests(BX_COUNTOF(s_argv), s_argv);
-	return PP_ERROR_NOINTERFACE;
-}
-
-PP_EXPORT void PPP_ShutdownModule()
-{
-}
 #else
 int main(int _argc, const char* _argv[])
 {