ERR Failed to compile droplet

[xinzweb]

Need some help here.

I am following the README to the point where I can do the push, but then, seems like compiling libevent failed:

   2017-12-12T11:44:16.72-0800 [STG/0] OUT Creating container
   2017-12-12T11:44:17.25-0800 [STG/0] OUT Successfully created container
   2017-12-12T11:44:17.25-0800 [STG/0] OUT Downloading app package...
   2017-12-12T11:44:17.34-0800 [STG/0] OUT Downloaded app package (125B)
   2017-12-12T11:44:18.02-0800 [STG/0] OUT =====> No cached compile detected. Bulding...
   2017-12-12T11:44:18.02-0800 [STG/0] OUT -----> Compiling libevent v2.0.21...
   2017-12-12T11:44:18.06-0800 [STG/0] ERR Failed to compile droplet: Failed to compile droplet: exit status 6
   2017-12-12T11:44:18.08-0800 [STG/0] OUT Exit status 223
   2017-12-12T11:44:18.09-0800 [STG/0] OUT Stopping instance f16bc770-7123-4fb1-9d2d-7cb1d6d58d89
   2017-12-12T11:44:18.09-0800 [STG/0] OUT Destroying container
   2017-12-12T11:44:18.59-0800 [STG/0] OUT Successfully destroyed container

How shall I move forward from here?

Thanks,
Shin