diff --git a/libcxx/CMakeLists.txt b/libcxx/CMakeLists.txt
--- a/libcxx/CMakeLists.txt
+++ b/libcxx/CMakeLists.txt
@@ -201,20 +201,10 @@
       "Use and install a linker script for the given ABI library"
       ${ENABLE_LINKER_SCRIPT_DEFAULT_VALUE})
 
-set(ENABLE_NEW_DELETE_DEFAULT ON)
-if (LIBCXXABI_ENABLE_NEW_DELETE_DEFINITIONS)
-# FIXME: This option should default to off. Unfortunatly GCC 4.9 fails to link
-# programs due to undefined references to new/delete in libc++abi so to work
-# around this libc++abi currently defaults LIBCXXABI_ENABLE_NEW_DELETE_DEFINITIONS
-# to ON. Once the GCC bug has been worked around this option should be changed
-# back to OFF.
-  set(ENABLE_NEW_DELETE_DEFAULT ON)
-endif()
-
 option(LIBCXX_ENABLE_NEW_DELETE_DEFINITIONS
     "Build libc++ with definitions for operator new/delete. This option can
-    be used to disable the definitions when libc++abi is expected to provide
-    them" ${ENABLE_NEW_DELETE_DEFAULT})
+     be used to disable the definitions when libc++abi is expected to provide
+     them" ON)
 
 # Build libc++abi with libunwind. We need this option to determine whether to
 # link with libunwind or libgcc_s while running the test cases.