diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
--- a/llvm/CMakeLists.txt
+++ b/llvm/CMakeLists.txt
@@ -649,12 +649,6 @@
   endforeach()
 endif()
 
-include(CheckSymbolExists)
-check_symbol_exists(proc_pid_rusage "libproc.h" HAVE_PROC_PID_RUSAGE)
-if(HAVE_PROC_PID_RUSAGE)
-  list(APPEND CMAKE_REQUIRED_LIBRARIES proc)
-endif()
-
 # Use libtool instead of ar if you are both on an Apple host, and targeting Apple.
 if(CMAKE_HOST_APPLE AND APPLE)
   include(UseLibtool)
diff --git a/llvm/cmake/config-ix.cmake b/llvm/cmake/config-ix.cmake
--- a/llvm/cmake/config-ix.cmake
+++ b/llvm/cmake/config-ix.cmake
@@ -352,6 +352,8 @@
   unset(HAVE_FFI_CALL CACHE)
 endif( LLVM_ENABLE_FFI )
 
+check_symbol_exists(proc_pid_rusage "libproc.h" HAVE_PROC_PID_RUSAGE)
+
 # Whether we can use std::is_trivially_copyable to verify llvm::is_trivially_copyable.
 CHECK_CXX_SOURCE_COMPILES("
 #include <type_traits>