[ns] 2.1b7a installing problem

[lewapryb@gazeta.pl]

Hi everyone!
I tried to install ns 2.1b7a on Fedora 4. I still got the same problem:

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?
make: *** [Tcl.o] Error 1
tclcl-1.0b10 make failed! Exiting ...

What should I do??? 
Could You help me??????