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+ActiveTcl is ActiveState's quality-assured distribution of Tcl.
+
+# see <http://www.activestate.com/Products/ActiveTcl/>
+# <http://www.tcl.tk/>
+
+If you want to use ActiveTcl binary package as the Tcl/Tk libraries,
+please use the following configure options.
+
+ --with-tcl-dir=<ActiveTcl_root>
+ --with-tk-dir=<ActiveTcl_root>
+
+And use the followings if you need.
+
+ --with-tcllib=<libname>
+ --with-tklib=<libname>
+ --enable-tcltk-stubs
+
+For example, when you install ActiveTcl-8.4.x to '/usr/local/ActiveTcl',
+
+ configure --with-tcl-dir=/usr/local/ActiveTcl/ \
+ --with-tk-dir=/usr/local/ActiveTcl/ \
+ --with-tcllib=tcl8.4 \
+ --with-tklib=tk8.4 \
+ --enable-tcltk-stubs
+
+It depends on your environment that you have to add the directory of
+ActiveTcl's dynamic link libraries to your library path when execute
+Ruby/Tk.
+
+# For example, on Linux, one of the ways is to use LD_LIBRARY_PATH
+# environment variable.
+#
+# [bash]$ LD_LIBRARY_PATH=/usr/local/ActiveTcl/lib:$LD_LIBRARY_PATH \
+# ruby your-Ruby/Tk-script
+#
+# [bash]$ LD_LIBRARY_PATH=/usr/local/ActiveTcl/lib:$LD_LIBRARY_PATH irb
+
+Then, you'll be able to use Tcl/Tk extension libraries included in the
+ActiveTcl package (e.g. call TkPackage.require('BWidget'), and then,
+use functions/widgets of BWidget extention).
+
+ Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)