diff -Nrup a/vendor/boringssl/CMakeLists.txt b/vendor/boringssl/CMakeLists.txt
--- a/vendor/boringssl/CMakeLists.txt	2021-03-22 18:48:14.000000000 +0100
+++ b/vendor/boringssl/CMakeLists.txt	2021-05-04 17:07:59.835325518 +0200
@@ -117,7 +117,7 @@ endif()
 if(CMAKE_COMPILER_IS_GNUCXX OR CLANG)
   # Note clang-cl is odd and sets both CLANG and MSVC. We base our configuration
   # primarily on our normal Clang one.
-  set(C_CXX_FLAGS "-Werror -Wformat=2 -Wsign-compare -Wmissing-field-initializers -Wwrite-strings -Wvla")
+  set(C_CXX_FLAGS "-Wformat=2 -Wsign-compare -Wmissing-field-initializers -Wwrite-strings -Wvla")
   if(MSVC)
     # clang-cl sets different default warnings than clang. It also treats -Wall
     # as -Weverything, to match MSVC. Instead -W3 is the alias for -Wall.