--- chromium-87.0.4280.40/third_party/angle/src/libANGLE/renderer/vulkan/vk_internal_shaders_autogen.cpp.system-zlib	2020-10-29 23:31:51.000000000 +0100
+++ chromium-87.0.4280.40/third_party/angle/src/libANGLE/renderer/vulkan/vk_internal_shaders_autogen.cpp	2020-10-31 12:45:44.809814951 +0100
@@ -10,7 +10,9 @@
 
 #include "libANGLE/renderer/vulkan/vk_internal_shaders_autogen.h"
 
+#ifndef USE_SYSTEM_ZLIB
 #define USE_SYSTEM_ZLIB
+#endif
 #include "compression_utils_portable.h"
 
 namespace rx
--- chromium-87.0.4280.40/third_party/angle/src/libANGLE/renderer/vulkan/gen_vk_internal_shaders.py.system-zlib	2020-10-29 23:31:51.000000000 +0100
+++ chromium-87.0.4280.40/third_party/angle/src/libANGLE/renderer/vulkan/gen_vk_internal_shaders.py	2020-10-31 12:41:12.681773748 +0100
@@ -40,7 +40,9 @@ template_shader_library_cpp = u"""// GEN
 
 #include "libANGLE/renderer/vulkan/vk_internal_shaders_autogen.h"
 
+#ifndef USE_SYSTEM_ZLIB
 #define USE_SYSTEM_ZLIB
+#endif
 #include "compression_utils_portable.h"
 
 namespace rx