=> Bootstrap dependency digest>=20010302: found digest-20190127
=> Checksum SHA1 OK for slack-api-1.6.1.gem
=> Checksum RMD160 OK for slack-api-1.6.1.gem
=> Checksum SHA512 OK for slack-api-1.6.1.gem
===> Installing dependencies for ruby27-slack-api-1.6.1
=> Tool dependency distcc-[0-9]*: found distcc-3.3
=> Build dependency cwrappers>=20150314: found cwrappers-20180325
=> Full dependency ruby27-multi_json>=1.0.3: found ruby27-multi_json-1.14.1
=> Full dependency ruby27-faraday>=0.11: found ruby27-faraday-0.17.3
=> Full dependency ruby27-faraday_middleware>=0.10.0: found ruby27-faraday_middleware-0.12.2
=> Full dependency ruby27-faye-websocket>=0.10.6: found ruby27-faye-websocket-0.10.7
=> Full dependency ruby27-base>=2.7.1: NOT found
=> Verifying /nonexistent for ../../lang/ruby27-base
make[1]: don't know how to make /nonexistent. Stop

make[1]: stopped in /usr/pkgsrc/lang/ruby27-base
*** Error code 2

Stop.
make: stopped in /usr/pkgsrc/net/ruby-slack-api