diff --git a/compiler-rt/cmake/config-ix.cmake b/compiler-rt/cmake/config-ix.cmake
index cf729c3adb1f..6cb01948c0f2 100644
--- a/compiler-rt/cmake/config-ix.cmake
+++ b/compiler-rt/cmake/config-ix.cmake
@@ -8,6 +8,8 @@ include(LLVMCheckCompilerLinkerFlag)
 include(CheckSymbolExists)
 include(TestBigEndian)
 
+set(COMPILER_RT_HAS_LIBEXECINFO 0)
+
 # The compiler driver may be implicitly trying to link against libunwind.
 # This is normally ok (libcxx relies on an unwinder), but if libunwind is
 # built in the same cmake invocation as compiler-rt and we're using the
diff --git a/libcxx/include/__config b/libcxx/include/__config
index a866a7e65183..74a2608a1fe5 100644
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -912,6 +912,8 @@ typedef __char32_t char32_t;
 #    define _LIBCPP_PROVIDES_DEFAULT_RUNE_TABLE
 #  endif
 
+#  define _LIBCPP_PROVIDES_DEFAULT_RUNE_TABLE
+
 #  if __has_feature(cxx_atomic) || __has_extension(c_atomic) || __has_keyword(_Atomic)
 #    define _LIBCPP_HAS_C_ATOMIC_IMP 1
 #    define _LIBCPP_HAS_GCC_ATOMIC_IMP 0
diff --git a/libcxx/include/__locale b/libcxx/include/__locale
index 93187dc1d0d9..bf1dc527c86f 100644
--- a/libcxx/include/__locale
+++ b/libcxx/include/__locale
@@ -15,6 +15,7 @@
 #if _LIBCPP_HAS_LOCALIZATION
 
 #include <__locale_dir/locale_base_api.h>
+#include <__locale_dir/locale_base_api/musl.h>
 #include <__memory/shared_count.h>
 #include <__mutex/once_flag.h>
 #include <__type_traits/make_unsigned.h>
diff --git a/libcxx/include/__locale_dir/locale_base_api.h b/libcxx/include/__locale_dir/locale_base_api.h
index 9d92a5ea1f0a..3847b1cb5abf 100644
--- a/libcxx/include/__locale_dir/locale_base_api.h
+++ b/libcxx/include/__locale_dir/locale_base_api.h
@@ -137,6 +137,8 @@
 #      include <__locale_dir/locale_base_api/musl.h>
 #    endif
 
+#    include <__locale_dir/locale_base_api/musl.h>
+
 #    include <__locale_dir/locale_base_api/bsd_locale_fallbacks.h>
 
 #    include <__cstddef/size_t.h>
diff --git a/libunwind/include/unwind.h b/libunwind/include/unwind.h
index b1775d3a3dec..04e4477fa9c5 100644
--- a/libunwind/include/unwind.h
+++ b/libunwind/include/unwind.h
@@ -13,7 +13,7 @@
 #ifndef __UNWIND_H__
 #define __UNWIND_H__
 
-#include <__libunwind_config.h>
+#include "__libunwind_config.h"
 
 #include <stdint.h>
 #include <stddef.h>
@@ -58,7 +58,7 @@ typedef struct _Unwind_Context _Unwind_Context;   // opaque
 #if defined(_LIBUNWIND_ARM_EHABI)
 #include <unwind_arm_ehabi.h>
 #else
-#include <unwind_itanium.h>
+#include "unwind_itanium.h"
 #endif
 
 typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)
diff --git a/llvm/cmake/config-ix.cmake b/llvm/cmake/config-ix.cmake
index 767774812ade..7c9cd60524aa 100644
--- a/llvm/cmake/config-ix.cmake
+++ b/llvm/cmake/config-ix.cmake
@@ -17,6 +17,8 @@ include(CheckCompilerVersion)
 include(CheckProblematicConfigurations)
 include(HandleLLVMStdlib)
 
+set(HAVE_BACKTRACE 0)
+
 if (ANDROID OR CYGWIN OR CMAKE_SYSTEM_NAME MATCHES "AIX|DragonFly|FreeBSD|Haiku|Linux|NetBSD|OpenBSD|SunOS")
   set(HAVE_MACH_MACH_H 0)
   set(HAVE_MALLOC_MALLOC_H 0)