30,31c30,31
< #ifndef __SYSTEMC_EXT_CORE__USING_HH__
< #define __SYSTEMC_EXT_CORE__USING_HH__
---
> #ifndef __SYSTEMC_EXT_DT__USING_HH__
> #define __SYSTEMC_EXT_DT__USING_HH__
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> #include "bit/_using.hh"
> #include "fx/_using.hh"
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> #include "misc/_using.hh"
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< #endif //__SYSTEMC_EXT_CORE__USING_HH__
---
> #endif //__SYSTEMC_EXT_DT__USING_HH__