Index: cmake/msvc.cmake
===================================================================
--- cmake/msvc.cmake	(revision 67605)
+++ cmake/msvc.cmake	(working copy)
@@ -59,11 +59,12 @@
 # - C4129: unrecognized escape sequence
 # - TODO: C4133: incompatible types
 # - C4163: 'identifier': not available as an intrinsic function
+# - C4189: local variable initialized but not referenced
 # - C4229: modifiers on data are ignored
 # - C4700: uninitialized variable usage
 # - C4603: macro is not defined or definition is different after precompiled header use
 # - C4716: function must return a value
-add_compile_flags("/we4013 /we4020 /we4022 /we4047 /we4098 /we4113 /we4129 /we4163 /we4229 /we4700 /we4603 /we4716")
+add_compile_flags("/we4013 /we4020 /we4022 /we4047 /we4098 /we4113 /we4129 /we4163 /we4189 /we4229 /we4700 /we4603 /we4716")
 
 # Enable warnings above the default level, but don't treat them as errors:
 # - C4115: named type definition in parentheses
Index: dll/opengl/mesa/swrast/CMakeLists.txt
===================================================================
--- dll/opengl/mesa/swrast/CMakeLists.txt	(revision 67605)
+++ dll/opengl/mesa/swrast/CMakeLists.txt	(working copy)
@@ -30,6 +30,8 @@
 add_library(mesa_swrast STATIC ${SOURCE})
 add_pch(mesa_swrast precomp.h SOURCE)
 
-if(NOT MSVC)
+if(MSVC)
+	add_target_compile_flags(mesa_swrast "/wd4189")
+else()
     add_target_compile_flags(mesa_swrast "-Wno-unused-variable")
 endif()
Index: lib/3rdparty/libxml2/CMakeLists.txt
===================================================================
--- lib/3rdparty/libxml2/CMakeLists.txt	(revision 67605)
+++ lib/3rdparty/libxml2/CMakeLists.txt	(working copy)
@@ -67,6 +67,8 @@
 add_pch(libxml2 libxml.h SOURCE)
 add_dependencies(libxml2 psdk)
 
-if(NOT MSVC)
+if(MSVC)
+	add_target_compile_flags(libxml2 "/wd4189")
+else()
     add_target_compile_flags(libxml2 "-w")
 endif()