diff --git a/include/bx/os.h b/include/bx/os.h
index 4fcd2c0..6fd9fef 100644
--- a/include/bx/os.h
+++ b/include/bx/os.h
@@ -11,17 +11,22 @@
 
 #if BX_PLATFORM_WINDOWS || BX_PLATFORM_WINRT
 #	include <windows.h>
-#elif BX_PLATFORM_ANDROID \
+#elif  BX_PLATFORM_ANDROID \
 	|| BX_PLATFORM_EMSCRIPTEN \
 	|| BX_PLATFORM_FREEBSD \
 	|| BX_PLATFORM_IOS \
 	|| BX_PLATFORM_LINUX \
 	|| BX_PLATFORM_NACL \
 	|| BX_PLATFORM_OSX \
+	|| BX_PLATFORM_PS4 \
 	|| BX_PLATFORM_RPI
 
 #	include <sched.h> // sched_yield
-#	if BX_PLATFORM_FREEBSD || BX_PLATFORM_IOS || BX_PLATFORM_NACL || BX_PLATFORM_OSX
+#	if BX_PLATFORM_FREEBSD \
+	|| BX_PLATFORM_IOS \
+	|| BX_PLATFORM_NACL \
+	|| BX_PLATFORM_OSX \
+	|| BX_PLATFORM_PS4
 #		include <pthread.h> // mach_port_t
 #	endif // BX_PLATFORM_IOS || BX_PLATFORM_OSX || BX_PLATFORM_NACL
 
@@ -29,7 +34,9 @@
 #		include <sys/nacl_syscalls.h> // nanosleep
 #	else
 #		include <time.h> // nanosleep
-#		include <dlfcn.h> // dlopen, dlclose, dlsym
+#		if !BX_PLATFORM_PS4
+#			include <dlfcn.h> // dlopen, dlclose, dlsym
+#		endif // !BX_PLATFORM_PS4
 #	endif // BX_PLATFORM_NACL
 
 #	if BX_PLATFORM_LINUX || BX_PLATFORM_RPI
@@ -107,7 +114,10 @@ namespace bx
 	{
 #if BX_PLATFORM_WINDOWS
 		return (void*)::LoadLibraryA(_filePath);
-#elif BX_PLATFORM_NACL || BX_PLATFORM_EMSCRIPTEN || BX_PLATFORM_WINRT
+#elif  BX_PLATFORM_EMSCRIPTEN \
+	|| BX_PLATFORM_NACL \
+	|| BX_PLATFORM_PS4 \
+	|| BX_PLATFORM_WINRT
 		BX_UNUSED(_filePath);
 		return NULL;
 #else
@@ -119,7 +129,10 @@ namespace bx
 	{
 #if BX_PLATFORM_WINDOWS
 		::FreeLibrary( (HMODULE)_handle);
-#elif BX_PLATFORM_NACL || BX_PLATFORM_EMSCRIPTEN || BX_PLATFORM_WINRT
+#elif  BX_PLATFORM_EMSCRIPTEN \
+	|| BX_PLATFORM_NACL \
+	|| BX_PLATFORM_PS4 \
+	|| BX_PLATFORM_WINRT
 		BX_UNUSED(_handle);
 #else
 		::dlclose(_handle);
@@ -130,7 +143,10 @@ namespace bx
 	{
 #if BX_PLATFORM_WINDOWS
 		return (void*)::GetProcAddress( (HMODULE)_handle, _symbol);
-#elif BX_PLATFORM_NACL || BX_PLATFORM_EMSCRIPTEN || BX_PLATFORM_WINRT
+#elif  BX_PLATFORM_EMSCRIPTEN \
+	|| BX_PLATFORM_NACL \
+	|| BX_PLATFORM_PS4 \
+	|| BX_PLATFORM_WINRT
 		BX_UNUSED(_handle, _symbol);
 		return NULL;
 #else
@@ -142,7 +158,8 @@ namespace bx
 	{
 #if BX_PLATFORM_WINDOWS
 		::SetEnvironmentVariableA(_name, _value);
-#elif BX_PLATFORM_WINRT
+#elif  BX_PLATFORM_PS4 \
+	|| BX_PLATFORM_WINRT
 		BX_UNUSED(_name, _value);
 #else
 		::setenv(_name, _value, 1);
@@ -153,7 +170,8 @@ namespace bx
 	{
 #if BX_PLATFORM_WINDOWS
 		::SetEnvironmentVariableA(_name, NULL);
-#elif BX_PLATFORM_WINRT
+#elif  BX_PLATFORM_PS4 \
+	|| BX_PLATFORM_WINRT
 		BX_UNUSED(_name);
 #else
 		::unsetenv(_name);
@@ -162,7 +180,8 @@ namespace bx
 
 	inline int chdir(const char* _path)
 	{
-#if BX_PLATFORM_WINRT
+#if BX_PLATFORM_PS4 \
+ || BX_PLATFORM_WINRT
 		BX_UNUSED(_path);
 		return -1;
 #elif BX_COMPILER_MSVC_COMPATIBLE
@@ -174,7 +193,8 @@ namespace bx
 
 	inline char* pwd(char* _buffer, uint32_t _size)
 	{
-#if BX_PLATFORM_WINRT
+#if BX_PLATFORM_PS4 \
+ || BX_PLATFORM_WINRT
 		BX_UNUSED(_buffer, _size);
 		return NULL;
 #elif BX_COMPILER_MSVC_COMPATIBLE
diff --git a/include/bx/platform.h b/include/bx/platform.h
index 08b31bf..d2684b0 100644
--- a/include/bx/platform.h
+++ b/include/bx/platform.h
@@ -200,6 +200,7 @@
 						|| BX_PLATFORM_NACL \
 						|| BX_PLATFORM_OSX \
 						|| BX_PLATFORM_QNX \
+						|| BX_PLATFORM_PS4 \
 						|| BX_PLATFORM_RPI \
 						)
 
diff --git a/include/compat/freebsd/signal.h b/include/compat/freebsd/signal.h
new file mode 100644
index 0000000..fd7d90f
--- /dev/null
+++ b/include/compat/freebsd/signal.h
@@ -0,0 +1 @@
+#include <sys/signal.h>