If SPECIFIC_PKGS is defined (at the top-level of pkgsrc), then instead of
looping through all the categories and then all the packages within that,
simply loop through ${SITE_SPECIFIC_PKGS}, ${HOST_SPECIFIC_PKGS},
${GROUP_SPECIFIC_PKGS} and ${USER_SPECIFIC_PKGS}, which are whitespace
separated lists of categories/packages e.g.
SITE_SPECIFIC_PKGS+= devel/cvs security/ssh
The default behaviour is unchanged - if SPECIFIC_PKGS is not defined,
the whole hierarchy will be traversed.
Modify mk.conf.example to reflect the settings of SPECIFIC_PKGS,
SITE_SPECIFIC_PKGS, HOST_SPECIFIC_PKGS, GROUP_SPECIFIC_PKGS and
USER_SPECIFIC_PKGS.
Modify the ispell package to use the make definition ISPELL_LANG,
rather than just LANG (which can clash with the environment variable
of the same name), and modify mk.conf.example accordingly.
