Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -164,6 +164,9 @@
 set(LIBUNWIND_BINARY_DIR  ${CMAKE_CURRENT_BINARY_DIR})
 set(LIBUNWIND_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LLVM_LIBDIR_SUFFIX})
 
+set(LIBUNWIND_INSTALL_PREFIX "" CACHE STRING
+    "Define libunwind destination prefix.")
+
 set(LIBUNWIND_C_FLAGS "")
 set(LIBUNWIND_CXX_FLAGS "")
 set(LIBUNWIND_COMPILE_FLAGS "")
Index: src/CMakeLists.txt
===================================================================
--- src/CMakeLists.txt
+++ src/CMakeLists.txt
@@ -133,6 +133,6 @@
 add_custom_target(unwind DEPENDS ${LIBUNWIND_TARGETS})
 
 install(TARGETS ${LIBUNWIND_TARGETS}
-        LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
-        ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX})
+  LIBRARY DESTINATION ${LIBUNWIND_INSTALL_PREFIX}lib${LLVM_LIBDIR_SUFFIX}
+  ARCHIVE DESTINATION ${LIBUNWIND_INSTALL_PREFIX}lib${LLVM_LIBDIR_SUFFIX})