I encoutered the following problem when I was installing ns-allinone-2.29 on red hat linux 9.0:
{standard input}: Assembler messages:
{standard input}:699: Error: symbol `dy' is already defined
{standard input}:705: Error: symbol `dx' is already defined
{standard input}:752: Error: symbol `q' is already defined
{standard input}:758: Error: symbol `p' is already defined
{standard input}:764: Error: symbol `q' is already defined
{standard input}:770: Error: symbol `q' is already defined
make: *** [tk3d.o] Error 1
tk8.4.14 make failed! Exiting ...
How could soleve this problem?Thank you!

do you have the correct kernel headers installed?