# 3. Build Forced
cd force/src
sudo make -f makefile.unix
^
makefile.unix:200: recipe for target 'obj/alert.o' failed
make: *** [obj/alert.o] Error 1
Are you using ubuntu 16.04 and did you install all dependencies?
#1 make sure your VPS has 4GB ram or more, if it doesn't use a swapfile.
#2 try make -f makefile.unix USE_UPNP=-