[ns] What does $d mean in the configure file of ns-2.1b6 ?

[Frank Chu <frankchu_ns@yahoo.com>]

I ran the configure under ns-2.1b6 (other packages
such as Tcl, tk, otcl, tclcl are all compiled
successfully).  I met the following mistake:

I found the NONE comes from $d which is empty. What
should I put in it ?  Thanks!

.....
checking for getnodebyname in -ldnet_stub... no
checking that c++ can handle -O2... yes
checking for tcl.h... -I../tcl8.0.4/generic
checking for libtcl8.0... -L../tcl8.0.4/unix -ltcl8.0
checking for init.tcl...
/u/lzhu/zhf/ns6/ns-2.1b6/../tcl8.0.4/library
checking for tclsh8.0.4... no
checking for tclsh8.0... /lusr/bin/tclsh8.0
checking for tk.h... configure: error: NONE is not a
directory


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