Now that I could manage to install ns2.28, nam is killing me

Please try to remove the extra qualification vector by removing them from the respective files. Another well-known issue is :

agent.h:73: error: invalid pure specifier (only `= 0' is allowed) before ‘;’ token

Solution: Try replacing the "NULL" in line 73 of file agent.h in nam-1.11 with "0". Bug reported and fix supplied by Qihe Wang.

Then :
$ make distclean
$ ./configure > output_config 2>&1

If output_config seems ok, then :

$ make > output_make 2>&1


Now check output_make.