[ns] problem with compilaion of make

[rakesh chouhan]

hi all ns-users
when i do some changes in some c++ file ,or add a new C++ file,
and like if we add a C++ file (ex-linkage.cc) in ns-2.31, do changes in
makefile by writing ex-linkage.o in OBJ_CC.

and when we recompile this by writing
make depend
there is a message: *Makefile:159: *** commands commence before first
target. Stop*
and after this I write
make
then same message generated:*Makefile:159: *** commands commence before
first target. Stop*
**
what's the problem with this code ,
I am using ns-2 on windowsXP with cygwin support

plz help me