[ns] ns2, otcl errors

[Lei Guang]

hi,friends,
  i am trying to install ns2 under fedora core (linux). i got some erros 

tclcl-mappings.h: In static member function `static int
TclObjectHelper<T>::dispatch_(void*, Tcl_Interp*, int, char**)':
tclcl-mappings.h:51: error: incomplete type `Tcl' used in nested name specifier
tclcl-mappings.h:52: error: invalid use of undefined type `struct Tcl'
tclcl-mappings.h:41: error: forward declaration of `struct Tcl'
tclcl-mappings.h:57: error: invalid use of undefined type `struct Tcl'
tclcl-mappings.h:41: error: forward declaration of `struct Tcl'

i believe someone has met these errors before. Any suggestion will be
greatly appreciated!
thanks a lot
-- 
Cheers
Lei