It may be that you can use the makefile, since Visual Studio contains a utility called
nmake[
^]. However, whether it works or not will depend on whether the makefile has been set up for nmake. If it hasn't then you need to add commands to the makefile for nmake. That would need a reasonable amount of knowledge and a fair bit of reading up.
Your second option is to use something like
MinGW[
^] which includes a gcc compiler that can make Windows library files. Not difficult but still a few hours of work at least.
However, the
SNMP++ download site[
^] contains MS VC++ 7.0 project files for download. I suggest that this would be far the easiest way