diff --git a/indra/cmake/00-Common.cmake b/indra/cmake/00-Common.cmake
index 6896d050fb026fea383b8baacd65e93be3547200..563f8929a489e636a0f95c2898fde16b0760cd54 100644
--- a/indra/cmake/00-Common.cmake
+++ b/indra/cmake/00-Common.cmake
@@ -206,8 +206,10 @@ if (DARWIN)
   # NOTE: it's critical to have both CXX_FLAGS and C_FLAGS covered.
   set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O0 ${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
   set(CMAKE_C_FLAGS_RELWITHDEBINFO "-O0 ${CMAKE_C_FLAGS_RELWITHDEBINFO}")
-  set(ENABLE_SIGNING TRUE)
-  set(SIGNING_IDENTITY "Developer ID Application: Linden Research, Inc.")
+  if (XCODE_VERSION GREATER 4.2)
+    set(ENABLE_SIGNING TRUE)
+    set(SIGNING_IDENTITY "Developer ID Application: Linden Research, Inc.")
+  endif (XCODE_VERSION GREATER 4.2)
 endif (DARWIN)