Index: libc/utils/UnitTest/CMakeLists.txt
===================================================================
--- libc/utils/UnitTest/CMakeLists.txt
+++ libc/utils/UnitTest/CMakeLists.txt
@@ -5,4 +5,4 @@
   LINK_COMPONENTS Support
 )
 target_include_directories(LibcUnitTest PUBLIC ${LIBC_SOURCE_DIR})
-add_dependencies(LibcUnitTest standalone_cpp)
+add_dependencies(LibcUnitTest standalone_cpp libc_test_utils)
Index: libc/utils/testutils/CMakeLists.txt
===================================================================
--- libc/utils/testutils/CMakeLists.txt
+++ libc/utils/testutils/CMakeLists.txt
@@ -1,8 +1,10 @@
-add_library(
+if(CMAKE_HOST_UNIX)
+  set(EFFile ExecuteFunctionUnix.cpp)
+endif()
+
+add_llvm_library(
   libc_test_utils
+  ${EFFile}
   ExecuteFunction.h
+  LINK_COMPONENTS Support
 )
-
-if(CMAKE_HOST_UNIX)
-  target_sources(libc_test_utils PRIVATE ExecuteFunctionUnix.cpp)
-endif()