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Remove mk/find-prefix.mk usage from the lang category.

The find-prefix infrastructure was required in a pkgviews world where
packages installed from pkgsrc could have different installation
prefixes, and this was a way for a dependency prefix to be determined.

Now that pkgviews has been removed there is no longer any need for the
overhead of this infrastructure.  Instead we use BUILDLINK_PREFIX.pkg
for dependencies pulled in via buildlink, or LOCALBASE/PREFIX where the
dependency is coming from pkgsrc.

Provides a reasonable performance win due to the reduction of `pkg_info
-qp` calls, some of which were redundant anyway as they were duplicating
the same information provided by BUILDLINK_PREFIX.pkg.

# $NetBSD: buildlink3.mk,v 1.57 2015/11/25 12:51:17 jperkin Exp $

BUILDLINK_TREE+=	perl

.if !defined(PERL_BUILDLINK3_MK)
PERL_BUILDLINK3_MK:=

.include "../../mk/bsd.fast.prefs.mk"
PERL5_REQD+=			5.22.0
.for _perl5_ver_ in ${PERL5_REQD}
BUILDLINK_API_DEPENDS.perl+=	perl>=${_perl5_ver_}
.endfor
# Prevent p5-* etc. packages built for 5.22.0 to be used
# with the next incompatible version of perl:
BUILDLINK_API_DEPENDS.perl+=	perl<5.24.0

BUILDLINK_PKGSRCDIR.perl?=	../../lang/perl5

_TOOLS_USE_PKGSRC.perl=	yes

PERL5=		${LOCALBASE}/bin/perl

pkgbase := perl
.include "../../mk/pkg-build-options.mk"

.if !empty(PKG_BUILD_OPTIONS.perl:Mthreads)
.  include "../../mk/pthread.buildlink3.mk"
.endif

PERL5_OPTIONS?=		# empty
.if !empty(PERL5_OPTIONS:Mthreads)
INSTALL_TEMPLATES+=	${.CURDIR}/../../lang/perl5/files/install_threads.tmpl
.endif

#
# Perl keeps headers and odd libraries in an odd path not caught by the
# default BUILDLINK_FILES_CMD, so name them to be symlinked into
# ${BUILDLINK_DIR}.
#
.include "../../lang/perl5/vars.mk"
BUILDLINK_FILES.perl=	${PERL5_SUB_INSTALLARCHLIB}/CORE/*
.endif # PERL_BUILDLINK3_MK

BUILDLINK_TREE+=	-perl