=> Bootstrap dependency digest>=20010302: found digest-20190127
WARNING: [license.mk] Every package should define a LICENSE.
===> Skipping vulnerability checks.
WARNING: No /opt/pkg/pkgdb/pkg-vulnerabilities file found.
WARNING: To fix run: `/opt/pkg/sbin/pkg_admin -K /opt/pkg/pkgdb fetch-pkg-vulnerabilities'.
===> Building for es-0.9a1nb4
bmake: bmake: don't know how to make /usr/include/sys/signal.h. Stop

bmake: stopped in /opt/work/shells/es/work/es-0.9-alpha1
*** Error code 2

Stop.
bmake[1]: stopped in /opt/pkgsrc/shells/es
*** Error code 1

Stop.
bmake: stopped in /opt/pkgsrc/shells/es