I'd like to build an app with the period or fasper code (chapter 13.8). Therfor i tried to create the xperiod example from the CD.

But all I get is the following error .I am working with Visual c++6 from MS, creating an App for comandline an implemeted period, xperiod and nr.h

does anyone know what i did wrong?

--------------------Configuration: period2 - Win32 Debug--------------------
Linking...
xperiod.obj : error LNK2001: unresolved external symbol "double __cdecl NR::gasdev(int &)" (?gasdev@NR@@YANAAH@Z)
period.obj : error LNK2001: unresolved external symbol "void __cdecl NR::avevar(class NRVec<double> const &,double &,double &)" (?avevar@NR@@YAXABV?$NRVec@N@@AAN1@Z)
period2___Win32_Debug/period2.exe : fatal error LNK1120: 2 unresolved externals
Error executing link.exe.

period2.exe - 3 error(s), 0 warning(s)