How did PS2 build without a condition variable implementation?

CMakeLists.txt

@@ -2647,7 +2647,7 @@ elseif(PS2)
   endif()
   if(SDL_THREADS)
     set(SDL_THREAD_PS2 1)
-    file(GLOB PS2_THREAD_SOURCES ${SDL3_SOURCE_DIR}/src/thread/generic/SDL_systls.c ${SDL3_SOURCE_DIR}/src/thread/generic/SDL_sysmutex.c ${SDL3_SOURCE_DIR}/src/thread/ps2/*.c)
+    file(GLOB PS2_THREAD_SOURCES ${SDL3_SOURCE_DIR}/src/thread/generic/SDL_syscond.c ${SDL3_SOURCE_DIR}/src/thread/generic/SDL_sysmutex.c ${SDL3_SOURCE_DIR}/src/thread/generic/SDL_systls.c ${SDL3_SOURCE_DIR}/src/thread/ps2/*.c)
     list(APPEND SOURCE_FILES ${PS2_THREAD_SOURCES})
     set(HAVE_SDL_THREADS TRUE)
   endif()