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Simply and speed up buildlink3.mk files and processing.
This changes the buildlink3.mk files to use an include guard for the
recursive include. The use of BUILDLINK_DEPTH, BUILDLINK_DEPENDS,
BUILDLINK_PACKAGES and BUILDLINK_ORDER is handled by a single new
variable BUILDLINK_TREE. Each buildlink3.mk file adds a pair of
enter/exit marker, which can be used to reconstruct the tree and
to determine first level includes. Avoiding := for large variables
(BUILDLINK_ORDER) speeds up parse time as += has linear complexity.
The include guard reduces system time by avoiding reading files over and
over again. For complex packages this reduces both %user and %sys time to
half of the former time.

# $NetBSD: buildlink3.mk,v 1.23 2009/03/20 19:24:36 joerg Exp $

BUILDLINK_TREE+=	ImageMagick

.if !defined(IMAGEMAGICK_BUILDLINK3_MK)
IMAGEMAGICK_BUILDLINK3_MK:=

BUILDLINK_API_DEPENDS.ImageMagick+=	ImageMagick>=5.5.7.11nb1
BUILDLINK_ABI_DEPENDS.ImageMagick+=	ImageMagick>=6.3.1.6nb1
BUILDLINK_PKGSRCDIR.ImageMagick?=	../../graphics/ImageMagick

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

.if !empty(PKG_BUILD_OPTIONS.ImageMagick:Mx11)
.include "../../x11/libX11/buildlink3.mk"
.endif
.if !empty(PKG_BUILD_OPTIONS.ImageMagick:Mjasper)
.include "../../graphics/jasper/buildlink3.mk"
.endif
.if !empty(PKG_BUILD_OPTIONS.ImageMagick:Mwmf)
.include "../../graphics/libwmf/buildlink3.mk"
.endif

.include "../../archivers/bzip2/buildlink3.mk"
.include "../../graphics/freetype2/buildlink3.mk"
.include "../../graphics/lcms/buildlink3.mk"
.include "../../graphics/libexif/buildlink3.mk"
.include "../../graphics/png/buildlink3.mk"
.include "../../graphics/tiff/buildlink3.mk"
.include "../../devel/libltdl/buildlink3.mk"
.include "../../textproc/libxml2/buildlink3.mk"
.endif # IMAGEMAGICK_BUILDLINK3_MK

BUILDLINK_TREE+=	-ImageMagick