diff --git a/libc/CMakeLists.txt b/libc/CMakeLists.txt
index ae555a256ba6..4e6b4195a9c5 100644
--- a/libc/CMakeLists.txt
+++ b/libc/CMakeLists.txt
@@ -47,8 +47,6 @@ set(LIBC_BUILD_DIR ${CMAKE_CURRENT_BINARY_DIR})
 
 set(LIBC_ENABLE_USE_BY_CLANG OFF CACHE BOOL "Whether or not to place libc in a build directory findable by a just built clang")
 
-set(LIBC_KERNEL_HEADERS "/usr/include" CACHE STRING "Path to Linux kernel headers")
-
 # Defining a global namespace to enclose all libc functions.
 set(default_namespace "__llvm_libc")
 if(LLVM_VERSION_MAJOR)
@@ -146,6 +144,11 @@ option(LLVM_LIBC_ALL_HEADERS "Outputs all functions in header files, regardless
 
 option(LIBC_CONFIG_PATH "The path to user provided folder that configures the build for the target system." OFF)
 
+if(LIBC_TARGET_OS_IS_LINUX)
+  set(kernel_headers "/usr/include")
+endif()
+set(LIBC_KERNEL_HEADERS "${kernel_headers}" CACHE STRING "Path to Linux kernel headers")
+
 set(LIBC_ENABLE_UNITTESTS ON)
 set(LIBC_ENABLE_HERMETIC_TESTS ${LLVM_LIBC_FULL_BUILD})
 
diff --git a/runtimes/cmake/Modules/HandleLibC.cmake b/runtimes/cmake/Modules/HandleLibC.cmake
index 01da5b260d3d..f8869512f99d 100644
--- a/runtimes/cmake/Modules/HandleLibC.cmake
+++ b/runtimes/cmake/Modules/HandleLibC.cmake
@@ -30,7 +30,9 @@ elseif (RUNTIMES_USE_LIBC STREQUAL "llvm-libc")
   check_cxx_compiler_flag(-nostdlibinc CXX_SUPPORTS_NOSTDLIBINC_FLAG)
   if(CXX_SUPPORTS_NOSTDLIBINC_FLAG)
     target_compile_options(runtimes-libc-headers INTERFACE "-nostdlibinc")
-    target_compile_options(runtimes-libc-headers INTERFACE "-idirafter${LIBC_KERNEL_HEADERS}")
+    if(LIBC_KERNEL_HEADERS)
+      target_compile_options(runtimes-libc-headers INTERFACE "-idirafter${LIBC_KERNEL_HEADERS}")
+    endif()
   endif()
 
   add_library(runtimes-libc-static INTERFACE)