unset Werror
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -44,7 +44,6 @@ include(CheckCXXCompilerFlag)
 check_cxx_compiler_flag("-Wall"                 TOML11_COMPILER_SUPPORTS_WALL)
 check_cxx_compiler_flag("-Wextra"               TOML11_COMPILER_SUPPORTS_WEXTRA)
 check_cxx_compiler_flag("-Wpedantic"            TOML11_COMPILER_SUPPORTS_WPEDANTIC)
-check_cxx_compiler_flag("-Werror"               TOML11_COMPILER_SUPPORTS_WERROR)
 check_cxx_compiler_flag("-Wsign-conversion"     TOML11_COMPILER_SUPPORTS_WSIGN_CONVERSION)
 check_cxx_compiler_flag("-Wconversion"          TOML11_COMPILER_SUPPORTS_WCONVERSION)
 check_cxx_compiler_flag("-Wduplicated-cond"     TOML11_COMPILER_SUPPORTS_WDUPLICATED_COND)