--- /dev/null
+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-tcltkversion=<version>
+ force version of Tcl/Tk libaray
+ (e.g. libtcl8.4g.so ==> --with-tcltkversion=8.4g)
+
+ --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 contains 'tcl.h'
+ --with-tk-include=<dir> the directry contains 'tk.h'
+
+ --with-tcl-lib=<dir> the directry contains 'libtcl<version>.so'
+ --with-tk-lib=<dir> the directry contains '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 contains 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 contais X11 header files
+ --with-X11-lib=<dir> the directry contais 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)
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