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+To compile 'tcltklib', you must have Tcl/Tk libraries on your environment. 
+Although 'extconf.rb' script searches Tcl/Tk libraries and header files, 
+sometimes fails to find them. And then, 'tcltklib' cannot be compiled. If 
+Tcl/Tk libraries or header files are installed but are not found, you can 
+give the information by arguments of the 'configure' script. Please give 
+some or all of the following options. 
+
+ --with-tcllib=<libname>       (e.g. libtcl8.4.so ==> --with-tcllib=tcl8.4)
+ --with-tklib=<libname>        (e.g. libtk8.4.so  ==> --with-tklib=tk8.4)
+
+ --enable-tcltk_stubs          (if you force to enable stubs)
+
+ --with-tcl-dir=<path> 
+      equal to "--with-tcl-include=<path>/include --with-tcl-lib=<path>/lib"
+
+ --with-tk-dir=<path> 
+      equal to "--with-tk-include=<path>/include --with-tk-lib=<path>/lib"
+
+ --with-tcl-include=<dir>      the directry containts 'tcl.h'
+ --with-tk-include=<dir>       the directry containts 'tk.h'
+
+ --with-tcl-lib=<dir>          the directry containts 'libtcl<version>.so'
+ --with-tk-lib=<dir>           the directry containts 'libtk<version>.so'
+
+ --enable-mac-tcltk-framework  (MacOS X) use Tcl/Tk framework
+                               (Obsolete. Please use '--enable-tcltk-framework'.)
+
+ --enable-tcltk-framework      use Tcl/Tk framework
+
+ --with-tcltk-framework=<dir>  the directory containts Tcl/Tk framework; 
+                               "<dir>/Tcl.framework" and "<dir>/Tk.framework".
+                               When this option is given, it is assumed that 
+                               --enable-tcltk-framework option is given also.
+
+ --with-tcl-framework-header=<dir>
+      Tcl framework headers directory 
+      (e.g. "/Library/Frameworks/Tcl.framework/Headers")
+
+ --with-tk-framework-header=<dir>
+      Tk framework headers directory 
+      (e.g. "/Library/Frameworks/Tk.framework/Headers")
+
+
+ --with-X11 / --without-X11    use / not use the X Window System
+
+ --with-X11-dir=<path> 
+      equal to "--with-X11-include=<path>/include --with-X11-lib=<path>/lib"
+
+ --with-X11-include=<dir>      the directry contains X11 header files
+ --with-X11-lib=<dir>          the directry contains X11 libraries
+
+
+If you forgot to give the options when do 'configure' on toplevel
+directry of Ruby sources, please try something like as the followings.
+
+ $ cd ext/tcltklib
+ $ rm Makefile
+ $ CONFIGURE_ARGS='--with-tcl-include=/usr/local/include/tcl8.4/ --with-tcllib=tcl8.4 --with-tklib=tk8.4' ruby extconf.rb
+
+
+ *** ATTENTION ***
+When your Tcl/Tk libraries are compiled with "pthread support", 
+Ruby/Tk may cause "Hang-up" or "Segmentation Fault" frequently. 
+If you have such a trouble, please try to use the '--enable-pthread' 
+option of the 'configure' command and re-compile Ruby sources. 
+It may help you to avoid this trouble. The following configure 
+options may be useful.
+
+  --enable-tcl-thread/--disable-tcl-thread
+  --with-tclConfig-file=<path of 'tclConfig.sh'>
+
+It is not need that 'tclConfig.sh' is a normal Tcl/Tk's tclConfig.sh. 
+But the file is expected to include the line "TCL_THREADS=0" or "...=1".
+When no "TCL_THREADS=?" line, if Tcl version is 7.x or 8.0 which is 
+given by "TCL_MAJOR_VERSION=?" line and "TCL_MINOR_VERSION=?" line, 
+then --disable-tcl-thread is expected. Else, ignore the 'tclConfig.sh'.
+If --enable-tcl-thread or --disable-tcl-thread option is given, then 
+--with-tclConfig-file option is ignored. 
+
+==========================================================
+                Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)