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
@@ -12,6 +12,7 @@
       collect_object_file_deps(${dep} dep_targets)
       list(APPEND all_deps ${dep_targets})
     endforeach(dep)
+    list(REMOVE_DUPLICATES all_deps)
     set(${result} ${all_deps} PARENT_SCOPE)
     return()
   endif()
@@ -33,6 +34,7 @@
       collect_object_file_deps(${dep} dep_targets)
       list(APPEND all_deps ${dep_targets})
     endforeach(dep)
+    list(REMOVE_DUPLICATES all_deps)
     set(${result} ${all_deps} PARENT_SCOPE)
     return()
   endif()