No rule to make target 'Xmr_WALLET_LIBRARY-NOTFOUND
Hi,
I am trying to compile the latest version on Ubuntu 18.04.1, but it failed. 

[ 95%] Building CXX object CMakeFiles/xmrblocks.dir/main.cpp.o
make[2]: *** No rule to make target 'Xmr_WALLET_LIBRARY-NOTFOUND', needed by 'xmrblocks'.  Stop.
CMakeFiles/Makefile2:69: recipe for target 'CMakeFiles/xmrblocks.dir/all' failed
make[1]: *** [CMakeFiles/xmrblocks.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2

I tried multiple times, including re-downloading the source, but the problem persists.