diff --git a/tools/CMakeLists.txt b/tools/CMakeLists.txt
index 8df1545..d124b19 100644
--- a/tools/CMakeLists.txt
+++ b/tools/CMakeLists.txt
@@ -10,12 +10,14 @@ if(LIBRW_PLATFORM_PS2)
     add_subdirectory(ps2test)
 endif()
 
-if(NOT LIBRW_PLATFORM_PS2)
-    add_subdirectory(playground)
-    add_subdirectory(lights)
-    add_subdirectory(subrast)
-    add_subdirectory(camera)
-    add_subdirectory(im2d)
-    add_subdirectory(im3d)
-    add_subdirectory(ska2anm)
+if(UNIX)
+    if(NOT LIBRW_PLATFORM_NULL AND NOT LIBRW_PLATFORM_PS2)
+        add_subdirectory(playground)
+        add_subdirectory(lights)
+        add_subdirectory(subrast)
+        add_subdirectory(camera)
+        add_subdirectory(im2d)
+        add_subdirectory(im3d)
+        add_subdirectory(ska2anm)
+    endif()
 endif()