Index: libcxxabi/trunk/CMakeLists.txt
===================================================================
--- libcxxabi/trunk/CMakeLists.txt
+++ libcxxabi/trunk/CMakeLists.txt
@@ -156,6 +156,13 @@
   set(LIBCXXABI_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBCXXABI_LIBDIR_SUFFIX})
 endif()
 
+set(LIBCXXABI_INSTALL_PREFIX "" CACHE STRING
+    "Define libc++abi destination prefix.")
+
+if (NOT LIBCXXABI_INSTALL_PREFIX MATCHES "^$|.*/")
+  message(FATAL_ERROR "LIBCXXABI_INSTALL_PREFIX has to end with \"/\".")
+endif()
+
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${LIBCXXABI_LIBRARY_DIR})
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${LIBCXXABI_LIBRARY_DIR})
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${LIBCXXABI_LIBRARY_DIR})
Index: libcxxabi/trunk/src/CMakeLists.txt
===================================================================
--- libcxxabi/trunk/src/CMakeLists.txt
+++ libcxxabi/trunk/src/CMakeLists.txt
@@ -174,8 +174,8 @@
 add_custom_target(cxxabi DEPENDS ${LIBCXXABI_TARGETS})
 
 install(TARGETS ${LIBCXXABI_TARGETS}
-  LIBRARY DESTINATION lib${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
-  ARCHIVE DESTINATION lib${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
+  LIBRARY DESTINATION ${LIBCXXABI_INSTALL_PREFIX}lib${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
+  ARCHIVE DESTINATION ${LIBCXXABI_INSTALL_PREFIX}lib${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
   )
 
 if (NOT CMAKE_CONFIGURATION_TYPES)