This definition controls whether the binary package which is built
during package installation will be copied to pkgsrc/packages/All.
To retain binary packages in pkgsrc/packages/All, set
PKGSRC_KEEP_BIN_PKGS=yes
in environment or MAKECONF. If this is not set, binary packages
will not be preserved after their WRKDIR is removed. This may not
be what you want.
To preserve the status quo since 2013/05/22, and just delete the
binary package after it's built, the default for PKGSRC_KEEP_BIN_PKGS
is "no", or it can be explicitly set.
As reviewed on tech-pkg.
4b9f0a9c84