=> Bootstrap dependency digest>=20211023: found digest-20220214
=> Checksum BLAKE2s OK for vowpal_wabbit-8.2.0.tar.gz
=> Checksum SHA512 OK for vowpal_wabbit-8.2.0.tar.gz
===> Installing dependencies for vowpal_wabbit-8.2.0nb21
=> Tool dependency libtool-base>=2.4.2nb9: found libtool-base-2.4.7nb1
=> Tool dependency mktools-[0-9]*: found mktools-20220614
=> Tool dependency automake>=1.9: found automake-1.16.5nb3
=> Tool dependency autoconf>=2.60: found autoconf-2.72
=> Tool dependency gmake>=3.81: found gmake-4.4.1
=> Tool dependency cwrappers>=20150314: found cwrappers-20220403
=> Build dependency boost-headers-1.86.*: NOT found
=> Verifying /nonexistent for ../../devel/boost-headers
make[1]: don't know how to make /nonexistent. Stop

make[1]: stopped in /usr/pkgsrc/devel/boost-headers
*** Error code 2

Stop.
make: stopped in /usr/pkgsrc/math/vowpal_wabbit