This macro determines how the standard headers are decorated for importing and exporting symbols from/to a shared version of the standard runtime/C/C++ library.

If this macro is defined to nothing then the headers are configured for linking against static libraries.

In the header file UseDLLPrefix.h the macro is defined to __declspec(dllimport). This will allow you to link against one of the supplied shared libraries. Other related macros

allow you to link with "part" of the shared library and an individual static library.

By default the previous macros are set to whatever _MSLIMP_EXP is set to (see ansi_parms.h). As an example, if you wish to link in the static version of the SIOUX library then you would edit ansi_parms.h and define _MSL_IMP_EXP_SIOUX to nothing and link in the appropriate static SIOUX lib.