=> Bootstrap dependency digest>=20010302: found digest-20190127
=> Checksum SHA1 OK for memoizable-0.4.2.gem
=> Checksum RMD160 OK for memoizable-0.4.2.gem
=> Checksum SHA512 OK for memoizable-0.4.2.gem
===> Installing dependencies for ruby26-memoizable-0.4.2
=> Build dependency cwrappers>=20150314: found cwrappers-20180325
=> Full dependency ruby26-thread_safe>=0.3.1: found ruby26-thread_safe-0.3.6nb1
=> Full dependency ruby26-base>=2.6.6: NOT found
=> Verifying /nonexistent for ../../lang/ruby26-base
make[1]: don't know how to make /nonexistent. Stop

make[1]: stopped in /usr/pkgsrc/lang/ruby26-base
*** Error code 2

Stop.
make: stopped in /usr/pkgsrc/misc/ruby-memoizable