make[2]: *** No rule to make target 'ext/CMakeFiles/cryptopp.dir/build'.  Stop.
CMakeFiles/Makefile2:1409: recipe for target 'ext/CMakeFiles/cryptopp.dir/all' failed
make[1]: *** [ext/CMakeFiles/cryptopp.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2