Error while building Burrowbeat


I have downloaded Go lang 1.7 in my Linux machine and I am trying to build Burrowbeat as per this guide

I have set ${GOPATH} using the command export GOPATH=/myfiles/gopath/

I have downloaded the zip file from and extracted it to /myfiles/gopath/. From the directory /myfiles/gopath/, I triggered the command make, which is showing the following error;

make update
make[1]: Entering directory `/myfiles/gopath/'
make[1]: *** No rule to make target `update'.  Stop.
make[1]: Leaving directory `/myfiles/gopath/'
make: *** [setup] Error 2

Why is this happening and how can I fix this? Thanks.