=> Bootstrap dependency digest>=20211023: found digest-20220214
=> Checksum BLAKE2s OK for as31_2.3.1.orig.tar.gz
=> Checksum SHA512 OK for as31_2.3.1.orig.tar.gz
===> Installing dependencies for as31-2.3.1
=> Tool dependency mktools-[0-9]*: found mktools-20220614
=> Tool dependency bison>=1.0: NOT found
=> Verifying /nonexistent for ../../devel/bison
make[1]: don't know how to make /nonexistent. Stop

make[1]: stopped in /usr/pkgsrc/devel/bison
*** Error code 2

Stop.
make: stopped in /usr/pkgsrc/devel/as31