python : An interpreted, interactive, object-oriented programming language ( http://www.python.org/ )
spidermonkey : Stand-alone JavaScript C library ( http://www.mozilla.org/js/spidermonkey/ )
tcl : Tool Command Language ( http://www.tcl.tk/ )
tk : Tk Widget Set ( http://www.tcl.tk/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a gmt
For Paludis use this rsync : rsync://gentoo.zugaina.org/gmt-portage
If you have a problem : ycarus(-at-)zugaina.org