diff --git a/cmake/ConfigureChecks.cmake b/cmake/ConfigureChecks.cmake
index 58021ac0f..2d7e4d4ea 100644
--- a/cmake/ConfigureChecks.cmake
+++ b/cmake/ConfigureChecks.cmake
@@ -56,13 +56,3 @@ check_type_size("wchar_t[8]" WCHAR_T_BITS LANGUAGE CXX)
 if(NOT POLICY CMP0067)
   list(APPEND CMAKE_REQUIRED_FLAGS "${CMAKE_CXX${CMAKE_CXX_STANDARD}_EXTENSION_COMPILE_OPTION}")
 endif()
-
-check_cxx_source_compiles("
-#include <sys/wait.h>
-
-int main() {
-    static_assert(WEXITSTATUS(0x007f) == 0x7f, \"This is our message we need to add because C++ is terrible\");
-    return 0;
-}
-"
-HAVE_WAITSTATUS_SIGNAL_RET)
diff --git a/config_cmake.h.in b/config_cmake.h.in
index 81887c52f..d0028e08e 100644
--- a/config_cmake.h.in
+++ b/config_cmake.h.in
@@ -20,40 +20,3 @@
 
 /* The size of wchar_t in bits. */
 #define WCHAR_T_BITS ${WCHAR_T_BITS}
-
-/* Enable large inode numbers on Mac OS X 10.5.  */
-#ifndef _DARWIN_USE_64_BIT_INODE
-# define _DARWIN_USE_64_BIT_INODE 1
-#endif
-
-/* Support __warn_unused on function return values. */
-#if __GNUC__ >= 3
-#ifndef __warn_unused
-#define __warn_unused __attribute__ ((warn_unused_result))
-#endif
-#else
-#define __warn_unused
-#endif
-
-/* Like __warn_unused, but applies to a type.
-   At the moment only clang supports this as a type attribute.
-
-   We need to check for __has_attribute being a thing before or old gcc fails - #7554.
-*/
-#ifndef __has_attribute
-  #define __has_attribute(x) 0  // Compatibility with non-clang and old gcc compilers.
-#endif
-
-#if defined(__clang__) && __has_attribute(warn_unused_result)
-#ifndef __warn_unused_type
-#define __warn_unused_type __attribute__ ((warn_unused_result))
-#endif
-#else
-#define __warn_unused_type
-#endif
-
-#if __has_attribute(fallthrough)
-#define __fallthrough__ __attribute__ ((fallthrough));
-#else
-#define __fallthrough__
-#endif