diff --git a/libcxx/include/__threading_support b/libcxx/include/__threading_support
--- a/libcxx/include/__threading_support
+++ b/libcxx/include/__threading_support
@@ -25,6 +25,9 @@
 #if defined(_LIBCPP_HAS_THREAD_API_PTHREAD)
 # include <pthread.h>
 # include <sched.h>
+#if defined(__clang__) && defined(__ELF__) && defined(__linux__)
+#pragma comment(lib, "pthread")
+#endif
 #endif
 
 _LIBCPP_PUSH_MACROS
diff --git a/libunwind/src/AddressSpace.hpp b/libunwind/src/AddressSpace.hpp
--- a/libunwind/src/AddressSpace.hpp
+++ b/libunwind/src/AddressSpace.hpp
@@ -27,6 +27,9 @@
 
 #if _LIBUNWIND_USE_DLADDR
 #include <dlfcn.h>
+#if defined(__clang__) && defined(__ELF__) && defined(__linux__)
+#pragma comment(lib, "dl")
+#endif
 #endif
 
 #ifdef __APPLE__