diff --git a/libc/cmake/modules/LLVMLibCLibraryRules.cmake b/libc/cmake/modules/LLVMLibCLibraryRules.cmake
--- a/libc/cmake/modules/LLVMLibCLibraryRules.cmake
+++ b/libc/cmake/modules/LLVMLibCLibraryRules.cmake
@@ -136,7 +136,7 @@
     "ADD_HEADER"
     "" # No optional arguments
     "" # No Single value arguments
-    "HDRS;DEPENDS" # Multi-value arguments
+    "HDRS;DEPENDS;COMPILE_OPTIONS" # Multi-value arguments
     ${ARGN}
   )
 
@@ -161,6 +161,9 @@
   if(ADD_HEADER_DEPENDS)
     add_dependencies(${interface_target_name} ${fq_deps_list})
   endif()
+  if(ADD_HEADER_COMPILE_OPTIONS)
+    target_compile_options(${interface_target_name} INTERFACE ${ADD_HEADER_COMPILE_OPTIONS})
+  endif()
 
   add_custom_target(${fq_target_name})
   add_dependencies(${fq_target_name} ${interface_target_name})
diff --git a/libc/src/string/memory_utils/CMakeLists.txt b/libc/src/string/memory_utils/CMakeLists.txt
--- a/libc/src/string/memory_utils/CMakeLists.txt
+++ b/libc/src/string/memory_utils/CMakeLists.txt
@@ -15,6 +15,8 @@
     memcpy_implementations.h
   DEPS
     .memory_utils
+  COMPILE_OPTIONS
+    "-fno-builtin-memcpy"
 )
 
 add_header_library(
diff --git a/libc/src/string/memory_utils/elements.h b/libc/src/string/memory_utils/elements.h
--- a/libc/src/string/memory_utils/elements.h
+++ b/libc/src/string/memory_utils/elements.h
@@ -511,8 +511,6 @@
     // __builtin_memcpy_inline guarantees to never call external functions.
     // Unfortunately it is not widely available.
     __builtin_memcpy_inline(dst, src, SIZE);
-#elif __has_builtin(__builtin_memcpy)
-    __builtin_memcpy(dst, src, SIZE);
 #else
     for_loop_copy(dst, src);
 #endif