Why I can't install ns2 on ubuntu 6.06

[zhihang wang]

I have installed tcl/tk 8.4 . When I install ns2 or otcl with ./configure.
the error occure:

checking for tcl.h... -I/usr/include/tcl8.4
checking for tclInt.h... no
checking for libtcl8.4... -L/usr/lib - ltcl8.4
checking for init.tcl... /usr/lib/tcl8.4
checking for http.tcl... /usr/lib/tcl8.4/http1.0
checking Tcl http.tcl library... yes
checking for tclsh8.4... /usr/bin/tclsh8.4
configure: error: Installation of tcl seems incomplete or can't be found
automatically.
Please correct the problem by telling configure where tcl is
using the argument --with-tcl=/path/to/package
(perhaps after installing it),
or the package is not required, disable it with --with-tcl=no.
zhihang at ubuntu :~/ns2/otcl-1.11$
-- 
Best Regards
zhihang wang
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