~$ cd /Volumes/openttd-0.1.1-amd64/OpenTTD.app/Contents/Resources/bin 
bin$ ./openttd 
dyld: Library not loaded: /usr/local/opt/libpng/lib/libpng16.16.dylib
  Referenced from: /Volumes/openttd-0.1.1-amd64/OpenTTD.app/Contents/Resources/bin/./openttd
  Reason: Incompatible library version: openttd requires version 53.0.0 or later, but libpng16.16.dylib provides version 52.0.0
Abort trap: 6
bin$