[ns] Installation problem (ns-src-2.1b6)

["Neeraj Poojary" <legolas_3@hotmail.com>]

hi all,
  i tried installing ns-src-2.1b6 (Jan 19) under an existing 
ns-allinone-2.1b5 installation as follows:
1> cd ns-allinone-2.1b5 ; tar xvf ../ns-src-2.1b6.tar
2> cd ns-2.1b6; configure --enable-shared
3> make

i get the following error
=================================================================
$ make
c++ -c -g -Wall -DNO_TK -DTCLCL_CLASSINSTVAR  -DNDEBUG -DUSE_SHM 
-DHAVE_LIBTCLCL1_0B8 -DHAVE_TCLCL_H -DHAVE_LIBOTCL1_0A4 -DHAVE_OTCL_H 
-DHAVE_LIBTK8_0 -DHAVE_TK_H -DHAVE_LIBTCL8_0 -DHAVE_TCL_H   -DSTDC_HEADERS=1 
-DHAVE_STRING_H=1 -DHAVE_TCL_H=1 -DHAVE_LIBTCL8_0=1 -DHAVE_TK_H=1 
-DHAVE_LIBTK8_0=1 -DHAVE_OTCL_H=1 -DHAVE_LIBOTCL1_0A4=1 -DHAVE_TCLCL_H=1 
-DHAVE_LIBTCLCL1_0B8=1 -DHAVE_GETRUSAGE=1 -DHAVE_SBRK=1 -DHAVE_STRTOQ=1  -I. 
-I../tclcl-1.0b8 -I../otcl-1.0a4 
-I/usr/users/npoojary/ns-allinone-2.1b5/ns-2.1b6/../tk8.0.4/generic 
-I../tcl8.0.4/generic  -o random.o random.cc
In file included from random.cc:40:
config.h:54: autoconf.h: No such file or directory
make: *** [random.o] Error 1
====================================================================

the following autoconf* files exist under ns-2.1b6:
autoconf-win32.h
autoconf.h.in
tcl/lib/{ns-autoconf.tcl, ns-autoconf.tcl.in}

... but no autoconf.h! my timid-newbie-guess is 'configure' normally creates 
an autoconf.h from autoconf.h.in but for some reason, it
did not this time. i'm running linux on a PC. did i miss a step/go wrong 
somewhere in the installation procedure? can i simply 'cp autoconf.h.in 
autoconf.h'? please let me know if you have any ideas.

thanks,
neeraj
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