=> Bootstrap dependency digest>=20211023: found digest-20220214
=> Checksum BLAKE2s OK for php-propro/propro-1.0.2.tgz
=> Checksum SHA512 OK for php-propro/propro-1.0.2.tgz
===> Installing dependencies for php56-propro-1.0.2
=> Tool dependency libtool-base>=2.4.2nb9: NOT found
=> Verifying /nonexistent for ../../devel/libtool-base
make[1]: don't know how to make /nonexistent. Stop

make[1]: stopped in /amd/pkgsrc/CHROOT/P/pkgsrc/devel/libtool-base
*** Error code 2

Stop.
make: stopped in /amd/pkgsrc/CHROOT/P/pkgsrc/www/php-propro