diff --git a/CMakeLists.txt b/CMakeLists.txt
index 74f69a8a7..1c095f475 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -30,7 +30,7 @@ if( CMAKE_CXX_COMPILER_ID MATCHES "Clang" )
     set( CMAKE_C_FLAGS_RELEASE          "-O4 -DNDEBUG" )
     set( CMAKE_C_FLAGS_RELWITHDEBINFO   "-O2 -g" )
 
-    set( CMAKE_CXX_FLAGS                "${CMAKE_CXX_FLAGS} -Weverything -Wno-c++98-compat -Wno-c++98-compat-pedantic -Wno-padded -Wno-undefined-reinterpret-cast -Wno-global-constructors -Wno-exit-time-destructors" )
+    set( CMAKE_CXX_FLAGS                "${CMAKE_CXX_FLAGS} -Weverything -Wno-c++98-compat -Wno-c++98-compat-pedantic -Wno-padded -Wno-undefined-reinterpret-cast -Wno-global-constructors -Wno-exit-time-destructors -Wno-missing-prototypes -Wno-documentation-unknown-command")
     set( CMAKE_CXX_FLAGS_DEBUG          "-g" )
     set( CMAKE_CXX_FLAGS_MINSIZEREL     "-Os -DNDEBUG" )
     set( CMAKE_CXX_FLAGS_RELEASE        "-O4 -DNDEBUG" )