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+Generic Mapping Tools (GMT) is an open source collection of ~60 tools for
+manipulating geographic and Cartesian data sets (including filtering,
+trend fitting, gridding, projecting, etc.) and producing Encapsulated
+PostScript File (EPS) illustrations ranging from simple x-y plots via
+contour maps to artificially illuminated surfaces and 3-D perspective
+views. GMT supports ~30 map projections and transformations and comes
+with support data such as GSHHS coastlines, rivers, and political
+boundaries. GMT is developed and maintained by Paul Wessel and Walter
+H. F. Smith with help from a global set of volunteers, and is supported
+by the National Science Foundation. It is released under the GNU General
+Public License.
+
+GMT requires netcdf, available at SlackBuilds.org.
+
+In order to build GMT, there are a number of required archives:
+
+GMT4.4.0_doc.tar.bz2 
+GMT4.4.0_share.tar.bz2 
+GMT4.4.0_src.tar.bz2
+GMT4.4.0_suppl.tar.bz2 
+GMT4.4.0_triangle.tar.bz2 (if you require Shewchuk's triangulation 
+routine (see below)).
+
+These must all be downloaded and placed in the same directory as the
+SlackBuild script (as with any source).
+
+There are a number of different resolution coastline files available
+for GMT, and their size on disk varies from <2MB (low) to 61.7MB
+(full). They come in 3 separate archives:
+
+GSHHS1.10_coast.tar.bz2 
+GSHHS1.10_high.tar.bz2 
+GSHHS1.10_full.tar.bz2
+
+The first contains the low, intermediate and coarse resolutions,
+the second the high resolution, and the third the full resolution. I
+prefer to have all of them installed (disk space is cheap), but you
+may not. Therefore, by default, all three sets will be installed,
+unless you choose otherwise in the script. e.g. ${COASTS:-"coast"}
+would install only the low, intermediate and coarse resolutions. A
+minimum of GSHHS1.10_coast.tar.bz2 is required.
+
+To download all the files, the following works: 
+wget ftp://ftp.soest.hawaii.edu/gmt/GMT4.4.0_{doc,share,src,suppl,triangle}.tar.bz2 ftp://ftp.soest.hawaii.edu/gmt/GSHHS1.10_{full,coast,high}.tar.bz2
+
+Please note, Shewchuk's triangulation routine used in some parts of
+GMT is not distributed under the GNU Public Licence. If you work for a
+for-profit organisation, you should read Shewchuk's copyright statement
+(in $PKG/src/README.TRIANGLE) first. This script enables the (much
+faster) Shewchuk triangulation routine by default; should you need to
+change this behaviour, set SHEWCHUK to "no" in the build script.