5. There's no Tcl installed on your shell

If there's really no Tcl installed on your shell, you can install
it temporarily in /tmp or your /home. Get the latest version of Tcl from
ftp://ftp.scriptics.com/pub/tcl/ and follow the installation steps in its
README file. After you've installed Tcl, you have to make configure detect
Tcl. To achieve this, you have to set either environmental variables:

export LD_LIBRARY_PATH=/path/to/tcl/lib
export TCLLIB=/path/to/tcl/lib
export TCLINC=/path/to/tcl/include

Please note that on some UNIX machines export doesn't work, and you
have to use 'setenv' instead or to pass configure the full qualified
path to Tcl:

./configure --with-tcllib=/path/to/libtclx.x.so
--with-tclinc=/path/to/tcl.h