Linking errors
I'm trying to compile openmonero but getting this error:

```
...
[100%] Linking CXX executable openmonero
/usr/bin/ld: cannot find -lcryptoxmr
collect2: error: ld returned 1 exit status
CMakeFiles/openmonero.dir/build.make:128: recipe for target 'openmonero' failed
make[2]: *** [openmonero] Error 1
CMakeFiles/Makefile2:69: recipe for target 'CMakeFiles/openmonero.dir/all' failed
make[1]: *** [CMakeFiles/openmonero.dir/all] Error 2
Makefile:127: recipe for target 'all' failed
make: *** [all] Error 2
```

I tried it with Ubuntu 16.04 and 17.04 and various versions of the monero code but nothing works.

Any ideas?