Otcl compilation problem

[cdfultz@cs.purdue.edu (Charles Fultz)]

(Note: I'm building ns from ns-allinone-2.1b5a.tar.gz)
While compiling Otcl-1.0a4 I get the following error message:

I already have Tcl-8.0 and Tk-8.0 installed on my system from previous
installations, so I commented out their installation sections in the
install script.  Also, all throughout the install script I've changed
all instances of '--with-tcl=../tclbox' and '--with-tk=../tkbox' to
the appropriate directories for my installation.  Also, I've changed
the '--with-tcl-ver=8.0.4' to '--with-tcl-ver=8.0' and
'--with-tk-ver=8.0.4' to '--with-tk-ver=8.0'.  And, I've copied
ns-allinone-2.1b5/tcl8.0.4/generic/tclInt.h to the appropriate include
directory on my system. 
Can you give an explanation as to why the compilation is failing?

Thanks in advance,
Charles D. Fultz
cdfultz@purdue.edu