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See the pkgsrc guide search for "builtin.mk".  Some of what you want
already happens.

The problem is that often a particular version is demanded, and pkgsrc
will provide that version rather than some other almost-but-not-quite
that's already there.  The real question is declaring the required
interface because that's what all the foo-using packages expect.

Even on NetBSD this issue exists, particularly with libraries that are
part of XFree86:

> type -a fc-cache
fc-cache is /usr/pkg/bin/fc-cache
fc-cache is /usr/X11R6/bin/fc-cache

So, it should be possible to write a builtin.mk for lang/perl5.  But
if the perl in the base OS isn't recent enough, some packages will
want pkgsrc perl anyway.

See devel/zlib, devel/gettext-lib, and security/openssl for examples.


=2D-=20
        Greg Troxel <gdt@ir.bbn.com>

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