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Hello, sorry for the silly question but I'm not know very well the Cygwin.
I follow the video but under download/libjson-rpc-cpp i didnt find the "build" directory, I make one , and when I type cmake I received this error:

"...
CMake Error at cmake/FindJSONCPP.cmake:33 (MESSAGE):
  Could not find libjsoncpp
Call Stack (most recent call first):
  src/jsonrpccpp/CMakeLists.txt:1 (find_package).."

Can someone help me?
thankyou very much!!
Luca