blt source package in Huanghe V3.0
blt: graphics extension library for Tcl/Tk - run-time
blt-demo: graphics extension library for Tcl/Tk - demos and examples
blt-dev: graphics extension library for Tcl/Tk - development files
tk8.6-blt2.5: graphics extension library for Tcl/Tk - library
tk8.6-blt2.