blt - 2.5.3+dfsg-7+b1 main

BLT is a library of useful extensions for the Tcl language and the
popular Tk graphical toolkit. It adds a vector and tree data type,
background execution and some debugging tools to Tcl, and provides
several new widgets for Tk, including graphs, bar-charts, trees, tabs,
splines and hyper-links, as well as a new geometry manager, drag &
drop support, and more.
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This package is a dummy package which depends on the current BLT
library.