Installing and cross-linking C API (.3) docs
Installing and cross-linking command (.n) docs
tcl8.4.15 installation succeeded.
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* Build Tk8.4.15
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make: *** No rule to make target `/ns-allinone-2.32/tk8.4.15/unix/Makefile.in', needed by `Makefile'. Stop.
loading cache ./config.cache
checking for Tcl configuration... (cached) found /ns-allinone-2.32/tcl8.4.15/unix/tclConfig.sh
checking for existence of /ns-allinone-2.32/tcl8.4.15/unix/tclConfig.sh... could not find /home/robbert/Downloads/ns-allinone-2.32/tcl8.4.15/unix/tclConfig.sh
checking for tclsh... (cached) No tclsh found on PATH
checking for tclsh in Tcl build directory... /ns-allinone-2.32/tcl8.4.15/unix/tclsh
configure: error: /ns-allinone-2.32/tcl8.4.15/unix/tclConfig.sh is for Tcl .
Tk 8.4.15 needs Tcl 8.4.
Use --with-tcl= option to indicate location of tclConfig.sh file for Tcl 8.4.
tk8.4.15 configuration failed! Exiting ...
Tk is not part of the ns project. Please see www.Scriptics.com
to see if they have a fix for your platform.

What command did you use to get this error?
What kind of error?
What were you trying to achieve (what do you want)?
The error mentions tcl and tk.

The make file has not been configured.

if it's a kernel run
If it's a program, cd to the dir then run configure...
check the readme file for tips,
usually in the middle of the page.
the run make and sudo to make install.

HTH, Glenn