Trouble installing GNUnet 0.16.3 on Linux Mint

[Willow Liquorice]

Hello,

I've decided to try and update the (hideously outdated) GNUnet 
installation on my system, and have ran into some trouble after 
completing the process: "gnunet-arm -s" crashes as it can't find its own 
shared library.

I followed the conventional process for installation from the Git 
repository:

./bootstrap
./configure
make
sudo make install

When I run "gnunet-arm -s" (or "sudo -u gnunet gnunet-arm -s") as the 
various slightly different installation guides suggest, I am met with 
the following message:

gnunet-arm: error while loading shared libraries: libgnunetarm.so.2: 
cannot open shared object file: No such file or directory

I'm stumped, as I've followed the installation instructions almost 
exactly as they are in the README. I found the offending library in 
/usr/local/lib:

lrwxrwxrwx 1 root root       21 Jun  3 18:54 libgnunetarm.so.2 -> 
libgnunetarm.so.2.0.0
-rwxr-xr-x 1 root root   106656 Jun  3 18:54 libgnunetarm.so.2.0.0

Is this correct?

Best wishes,
        Willow