STL_VER
Use the STL_VER macro to specify the version of the Standard Template Library (STL) to use in the build process. This macro must be used with the USE_STL macro.
The only scenario reason STL_VER should be used is to specify STL_VER=60. USE_STL must also be set for this to occur.
If USE_STL is set, STL_VER defaults to 70. In this case, you do not have to specify STL_VER.
STL_VER=60 is used to cause the linker to use the STL60-specific libraries over the STL70 libraries.
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Build date: 5/3/2011